KACO Double Writing Length Retractable Gel Pen Refill, 0.5mm Double Ball Bead Tip, Signature Pen Refill, Blue-Black Ink, No Leakage, 10 Pieces/box K1622

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

Transparent pen tube for ink level visibility

Removable pen tip protective cap that can be inserted into the refill tail to extend refill length, allowing compatibility with more pen models (applicable to 110mm refills)

Tungsten carbide dual ball tip for smoothness and durability

Complies with GB/T37853-2019 and GB21027-2020 national standards

Writing length approximately twice (800m) or 1.5 times (600m) the national standard for 0.5mm refills depending on model (110mm or 100mm refill length)

Available in single refill packs and 10-pack boxes

Various packaging options for different tip types and colors

1. Remove the pen tip protective cap

2. Insert the cap into the tail end of the 110mm refill

3. Adjust the overall refill length to fit non-KACO pen models

Writing at 65-70° angle on standard GB/T12654 compliant paper at 70mm/s speed for 100mm line

Overlay with same paper and apply pressure for 1 minute

Check for ink transfer on overlay paper to confirm drying performance

KACO Gel Ink Refills offer professional-grade, richly pigmented ink with multiple tip options and sizes, quick-drying and waterproof properties, and large ink capacity for long-lasting use. Designed for compatibility with a wide range of KACO pens and enhanced with practical features like refill length adjustment and transparent barrels for ink monitoring, these refills are ideal for important exams and daily writing needs.