Erasable Gel Ink Ballpoint Pen Pilot Frixion Ball Knock Zone Ballpoint Pen 0.5mm Set of 3 With a great trial set! Gel Ink Ballpoint Pen Trial Set ● Includes a bonus of 2 refills for FRIXION BALL KNOCK ZONE! ● The "Frixion Ball Knock Zone" is the next-generation erasable ballpoint pen that uses the newly developed "Premium Frixion Ink" that allows you to write "darker and longer," in response to users' requests for darker writing and increased ink capacity. ● Furthermore, it achieves stable writing that suppresses pen tip wobble and a quiet clicking sound. ● With its new features, it supports improved concentration during writing for marketers, creators, and business people who often engage in creative thinking. ● Ink: Frixion Ink (water-based gel ink) *Complete decolorization temperature: around 65°C ● Ink color: Black