**Product Specifications:**
**Brand:** KACO
**Model:** KEFILL
**Ink Type:** Gel, Ink Refill
**Drying Time:** 1 second*
**Pen Tips:** Two types
**Features:** Self-contained extension cap
**Ink Color:** Classic four colors (Red, Blue, Black, Blue Black)
**Ink Technology:** 1-second quick-drying ink with dual-ballpoint craftsmanship
**Writing Experience:** Upgraded for smooth and clean writing
**Pen Refill Length:** KEFILL standard and 100 refill provide extended writing capacity
**Ink Capacity:** High capacity for long-lasting writing
**Writing Length:** Exceeds national standards for pen stroke length
**Pen Compatibility:** Suitable for various pen models including MIDOT, KEYBO, PURE, KLIP, ALPHA, ROCKET, K9, TURBO, SMOOTH, K7, and FIRST series
**Pen Tip:** Tungsten carbide ballpoint for smooth and durable writing
**Packaging Options:** Available in 5-pack and 10-pack
**Transparent Barrel:** Allows easy monitoring of ink level
**Additional Features:** Interchangeable pen tip protection cap for adjusting refill length
**Standard Compliance:** GB/T37853-2019, GB21027-2020
**Dimensions:** 110mm length, 5.7mm diameter
*Note: Specifications marked with * are based on internal testing and may vary in actual usage scenarios.
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