Compiled from 6 sources; we haven't tested this product ourselves yet. How we research
Quick answer
The Pilot FriXion Synergy Clicker is a retractable erasable gel pen with Pilot's fine Synergy Tip, sold in the US as Extra Fine 0.5 mm. Its twin in Japan, the FriXion Synergy Knock LFSK-15, is 142.2 mm long and weighs 9.3 g, and Pilot says the ink turns clear above 60 °C (140 °F) when rubbed.
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The Synergy Knock 0.5, 142.2 mm long (drawn at 1 mm = 5 px).
Product facts
Product
Pilot FriXion Synergy Clicker erasable gel pen (Extra Fine; FriXion Synergy Knock LFSK-14 / LFSK-15 in Japan)
Resin barrel and clip-knock, rubber eraser; Synergy Tip; FriXion thermo-sensitive gel ink (Pilot Japan)
Price range
$under $5 per pen (multi-packs divided by the count)
Ink colors
Black
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Notes on these facts
Made by Pilot Corporation (Japan); sold in the US by Pilot Corporation of America. Country of manufacture not stated: Pilot USA's product page, Pilot Japan's web catalog and its February 7, 2024 press release (read October 23, 2026) don't state a country of manufacture, and the Amazon US listings we read give none. Price: example listing.
Colors: names per Pilot USA, checked October 24, 2026. Ink colors per Pilot USA, all in the Extra Fine point. Tints are the color-chip values on Pilot USA's page. Tints are representative, not measured. Shops stock different colors.
Price bands are typical US retail, checked October 2026. Conversions to US dollars are approximate, at October 2026 rates (US$1 = ¥158 = ₩1,330 = NT$32.5 = CN¥6.7 = SEK 9.9 = DKK 6.7 = ₺49.6 = C$1.41 = A$1.43 = CZK 21.7; €1 = US$1.12; £1 = US$1.32; CHF 1 = US$1.21).
Key takeaways
Pilot Japan lists the Synergy Knock 0.5 (LFSK-15) at 142.2 mm (5.6 in) long, 10.5 mm at the widest and 9.3 g, drawing a 0.25 mm line.
Pilot Japan launched the Synergy Knock on March 4, 2024 in 0.3, 0.4 and 0.5 mm; the 0.3 mm is the finest FriXion tip yet.
Pilot USA sells one point, Extra Fine; Amazon lists it as 0.5 mm, in packs of 2 to 12.
Pilot USA says the ink turns colorless above 140 °F (60 °C) and comes back if cooled to 14 °F (−10 °C).
The black 5-pack (item 17348) had 7,126 Amazon US ratings on October 23, 2026.
What is the Pilot FriXion Synergy Clicker?
It’s a retractable FriXion erasable gel pen fitted with Pilot’s Synergy Tip, a fine tip made for small handwriting. You write, rub the rubber end over a mistake, and the friction heat turns the ink clear.
Pilot USA sells it in one point, Extra Fine, and Amazon lists it at 0.5 mm. In Japan, Pilot sells the same pen as the FriXion Synergy Knock (LFSK), in 0.3, 0.4 and 0.5 mm.
It is one of the best-selling erasable pens in the US: the black 5-pack had 7,126 Amazon US ratings and “8K+ bought in past month” when we checked on October 23, 2026.
FriXion Synergy Clicker specs
Spec
Value
Maker
Pilot Corporation (Tokyo, Japan)
US point
Extra Fine, 0.5 mm (Pilot USA, Amazon)
Japan tips
0.3, 0.4 (LFSK-14) and 0.5 mm (LFSK-15)
Line width
0.25 mm from the 0.5 mm tip (Pilot Japan)
Mechanism
Clip-slide knock: press the clip to extend the tip
Length
142.2 mm (5.6 in) (Pilot Japan)
Widest point
10.5 mm (0.41 in)
Weight
9.3 g (Pilot Japan)
Ink
FriXion thermo-sensitive gel ink
Refills (Japan)
LFRF-15 (0.5 mm), LFRF-14 (0.4 mm)
Price
¥275 (about US$1.70) in Japan; $ band in the US
Sizes and refills come from Pilot Japan’s web catalog for the Synergy Knock. Pilot USA doesn’t publish a size, so check that the US pen matches before relying on the Japanese figures.
The three Japanese ball sizes to scale, and the Synergy Tip's pipe-plus-cone shape.
What is a Synergy Tip?
It’s Pilot’s own fine tip that joins a needle-like pipe tip at the front to a stronger cone tip behind it. Pilot Japan says this keeps a fine tip sturdy while widening the ink path, so it starts writing easily and writes smoothly.
Pilot says it developed a dedicated Synergy Tip for FriXion ink, whose particles are larger than ordinary gel ink, which is what made a 0.3 mm FriXion possible for the first time.
How does FriXion ink erase?
Rubbing with the rubber end heats the ink past about 60 °C (140 °F), where it turns colorless. Pilot USA says the color comes back if you cool the page to 14 °F (−10 °C), for example in a freezer.
That cuts both ways: a hot car or a laminator can make writing vanish. Pilot USA says erasable pens aren’t recommended for legal or official documents.
Mitsubishi Pencil’s uni-ball R:E ink works the same way, turning colorless at 60 °C; its last multi pen, the R:E3 BIZ, is now discontinued.
How is it different from the FriXion Clicker?
The Synergy Clicker writes finer; the FriXion Clicker comes in more colors and a bold point.
If you write in small planner boxes, the Synergy Clicker’s thinner line keeps letters from closing up. Our best erasable pens roundup names it the pick for small handwriting.
What does the Japanese Synergy Knock look like?
Pilot Japan gives every Synergy Knock a gray body and shows the ink color on the clip. The rubber eraser on the end changes color with the tip size, so you can tell 0.3, 0.4 and 0.5 mm apart in a pen cup.
Pilot Japan sells it in 8 ink colors: black, red, blue, green, blue-black, orange, pink and light blue. Pilot USA’s assortment is smaller, so a Japanese import is the way to get the 0.3 mm or the rarer colors.
Can you refill the Synergy Clicker?
Yes: Amazon’s US listings say refills are sold separately, and Pilot Japan names LFRF-15 for the 0.5 mm. Pilot Japan sells LFRF-153 as a black, red and blue 3-pack, and LFRF-15 singly in other colors.
Pilot USA’s standard 0.7 mm FriXion refills are for the regular Clicker and FriXion Ball, so match the refill to the Synergy Tip.
Where is the FriXion Synergy Clicker made?
Pilot doesn’t state it on the pages we read, and the Amazon US listings give no country of origin. Pilot is a Japanese company based in Tokyo.
Check the pack or barrel print if origin matters to you.
Frequently asked questions
What is the difference between the FriXion Clicker and the FriXion Synergy Clicker?
The Synergy Clicker has Pilot's Synergy Tip, a fine tip built for small writing, and Amazon lists it at 0.5 mm. The regular FriXion Clicker has a conventional cone tip in 0.7 mm Fine and 1.0 mm Bold.
What size is the FriXion Synergy Clicker tip?
Pilot USA calls it Extra Fine and Amazon lists 0.5 mm. In Japan the same body comes in 0.3, 0.4 and 0.5 mm, and Pilot Japan says the 0.5 mm draws a 0.25 mm line.
Why did my FriXion writing disappear?
FriXion ink turns colorless at about 140 °F (60 °C), so a hot car or a laminator can erase it. Pilot USA says cooling the page to 14 °F (−10 °C), in a freezer, brings the color back.
Can I use FriXion Synergy pens on legal documents?
No. Pilot USA says erasable pens are not recommended for legal or official documents, because heat or friction can remove the writing.
Is the FriXion Synergy Clicker refillable?
Yes. Amazon's listings say refills are sold separately; in Japan Pilot sells LFRF-15 refills for the 0.5 mm and LFRF-14 for the 0.4 mm.
How long is the Pilot FriXion Synergy Clicker?
Pilot Japan lists its twin, the Synergy Knock, at 142.2 mm (5.6 in) long and 10.5 mm at the widest, weighing 9.3 g. Pilot USA doesn't publish a size for the US pen.
Is the FriXion Synergy Clicker made in Japan?
Pilot doesn't say on the pages we read, and the Amazon US listings give no country. Pilot is a Japanese company based in Tokyo.
What ink colors does the FriXion Synergy Clicker come in?
Pilot USA lists five colors for the Extra Fine Synergy Clicker: black, blue, red, green and purple.
