KACO Yage Kefill Gel Pen Refills, Retractable Pen Refills, Replacement Pen Refills, 0.45mm St Pen Tip, Quick-Drying Black, 800m Writing Length, Push-Button Pen Refills, Water-Based Pen Refills, Pack of 10

Red, Blue, and Blue-black inks are non-quick-dry

110mm (approx. 800 meters writing length, about 2x national standard)

100mm (approx. 600 meters writing length, about 1.5x national standard)

Single refill per bag

10 refills per box

Suitable for various KACO pen models including PURE, ROCKET, POPUP, KEYBO, LINGYUE, KAIBAO, TWIST, K7, K10, FIRST, SMOOTH, and others

Refill length adjustable with extension cap for 110mm refills to fit non-KACO pens

Transparent refill barrel for ink level monitoring

Removable pen tip protection cap that can be inserted into the refill tail to extend length

Innovative and practical design for easy replacement and extended compatibility

GB/T37853-2019

GB21027-2020

KEFILL and SDRY series are trusted for important exams and daily writing

Ink drying speed tested with standardized method (65-70° pen angle, 70mm/s stroke speed)

Large capacity refills provide longer writing endurance without frequent replacement

Classic four-color ink options meet most writing needs