**Product Specifications:**
**Brand:** KACO
**Product Name:** KEFILL Neutral Pen Refill
**Ink Type:** Quick-drying
**Tip Size:** S
**Ink Color:** Classic four colors (red, blue, black, blue-black)
**Features:** Quick-drying ink, dual-ballpoint technology, built-in extended cap
**Innovation:** Next-generation KEFILL dual-ballpoint refill
**Variants:** ST Tip, Durable Writing Tip, Bullet Tip
**Writing Experience:** Smooth, consistent, and quick-drying
**Ink Options:** Single to multi-color, narrow to wide
**Ink Dry Time:** Tested for quick-drying performance
**Writing Angle:** 48° for smooth writing experience
**Ink Capacity:** Long-lasting for extended writing
**Tungsten Carbide Ballpoint:** Ensures smooth and durable writing
**Compatibility:** Fits most KACO pen models
**Refill Length:** 110mm for standard pens, 100mm for specific models
**Tip Protection:** Reversible tip cap for adjusting refill length
**Transparent Barrel:** Allows easy monitoring of ink level
**Package Contents:** Available in various tip sizes and colors
**Standard Compliance:** Meets GB/T37853-2019 and GB21027-2020 standards
**Dimensions:** 110mm length, 5.7mm diameter
**Additional Information:** Suitable for various KACO pen series
**Note:** Specifications may vary slightly based on the specific product variant.
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