**Product Specifications:**
**Brand:** uni
**Model:** UMR-83
**Product Name:** Gel Pen Refill
**Ink Color:** Black/Blue Black/Blue/Red (4 colors available)
**Tip Size:** 0.38mm
**Packaging:** 3 refills per pack
**Length:** 112mm (slight manual measurement error)
**Features:**
1. Water-based pigment ink for clear, non-bleeding lines that resist smudging and fading.
2. Dual-ball bullet tip for smooth writing, preventing ink leaks or backflows.
3. Transparent pen body for easy ink level monitoring, large ink capacity for long-lasting use.
4. Available in four everyday colors, suitable for various occasions.
**Origin:** Japan
**Compatibility:** Suitable for UMN-138 gel pens
**Note:** Please select desired color when purchasing: Black, Blue Black, Blue, Red.
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