**Product Specifications:**
**Brand:** KACO
**Model:** KEFILL
**Ink Type:** Gel ink
**Quantity:** 5 pieces
**Tip Type:** Dual ballpoint tip
**Writing Length:** Double the standard length
**Features:** Non-leaking, smooth writing experience, low friction with 48° writing angle
**Tip Material:** DuraBall stainless steel tip
**Writing Angle:** 48° for smooth and consistent writing
**Ink Colors:** Red, Blue, Black, Blue-Black
**Ink Capacity:** Approximately 800 meters
**Standard Compliance:** GB/T37853-2019
**Pen Refill Length:** 110mm
**Compatible with:** KACO K7 and K7 Panda Party pens
**Additional Features:** Leak-proof design, classic bullet tip, interchangeable ink cartridges
**Packaging Options:** Available in 5-piece and 10-piece packs
**Dimensions:** 110mm length, 5.7mm diameter
**Standard Compliance:** GB/T37853-2019, GB21027-2020
**Additional Information:**
KEFILL gel ink refills are designed for smooth, durable, and consistent writing experience. The dual ballpoint tip and DuraBall technology ensure a comfortable writing angle and reduced friction for extended writing sessions. The ink cartridges are leak-proof and come in classic ink colors to meet various writing needs. The transparent pen barrel allows for easy monitoring of ink levels, and the refill length is double the standard requirement for long-lasting use. The refill cartridges are designed to fit most KACO pens and can be adjusted for different pen models.
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