KACO KEFILL Dual Ballpoint Pen Refills 0.5mm 10-Pack Large Capacity Smooth Writing 800m Long-Lasting Ink Replacement for Click Gel Pens

0.7mm

Black

Red

Blue

Blue-black

Red, Blue, and Blue-black inks are not quick-drying

Meets or exceeds GB/T 37853-2019 national standard for 0.5mm pen cores (minimum 400 meters)

Single pen core per bag

10 pen cores per box

Available in single and multi-pack options (e.g., 10 pcs per pack)

GB/T 37853-2019

GB 21027-2020

GB/T 26699-2022 (for pigment-based black ink and ball diameter requirements)

Dual-ball pen tips allow smooth writing at lower angles (~48°) compared to single-ball tips (~60°)

Compatible with various KACO pen models including PURE, ROCKET, POPUP, KEYBO, TWIST, K7, K10, FIRST, SMOOTH, and others

Large ink capacity for extended writing duration

Suitable for important exams and daily writing tasks

Clear and easily scannable handwriting for official use

KACO KEFILL gel ink pen cores offer professional-grade, rich black ink with multiple tip options and sizes, enhanced smoothness, quick-drying and waterproof ink, and long-lasting writing performance. Designed for both exam reliability and everyday use, these pen cores comply with national standards and fit a wide range of KACO pen models.