KACO SDRY 0.5mm Quick-Dry Retractable Gel Pen Refills Black Smooth Ink 10pcs/Box Asian Standard Compatible

Tungsten carbide dual ball for smoothness and wear resistance

Clear and legible handwriting, easily recognized by computer scanning

Stable ink flow with no clogging during exams

Writing rhythm control for efficient note-taking

Fast drying tested by drawing a 100mm line at 70mm/s with 65-70° pen angle; drying verified by overlay test after 1 minute

Test paper conforms to GB/T12654 standard

Large ink capacity for longer writing duration

110mm refill writes approximately 800 meters (+/-10%), double the national standard minimum of 400 meters (GB/T37853-2019)

100mm refill writes approximately 600 meters (+/-10%), 1.5 times the national standard minimum

Available in single packs and 10-piece boxes

Each refill individually bagged

Transparent barrel for ink level monitoring

Reversible pen tip protector that doubles as an extender to adjust refill length, compatible with various KACO pen models (extension applicable only to 110mm refills)

Suitable for K7, K10, and other KACO gel pen series including metal body pens

GB/T37853-2019 (Writing length for 0.5mm gel pen refills)

GB21027-2020

GB/T26699-2022 (Pigment ink for exam pens)

GB/T12654 (Writing paper standard for drying tests)

Fast drying ink reduces smudging and increases writing speed

Designed specifically for important exams and daily writing needs

Tested for smoothness and durability with tungsten carbide dual ball technology