Deli 0.5mm Retractable Gel Pen Refills for Students, Compatible with S01/S08/1008/K35 and G-5, Black Bullet Tip, 20 Pieces/Box S782

Transparent ink tube with visible ink level

Wax-sealed design to protect pen tip and prevent ink drying

Spring-lock ballpoint tip prevents ink leakage and accumulation

Low friction Swiss MIKRON tungsten carbide ball with surface roughness reduced to 0.012 Ra and friction coefficient lowered to 0.2 μ (compared to standard 0.34 μ)

Smooth and consistent ink flow with no skipping or blotting

Long-lasting ink supply with stable and smooth writing experience

Comfortable hand feel and suitable line thickness for daily writing and note-taking

Compatible with deli S01 gel pen bodies and other similar retractable gel pens

High-quality workmanship and packaging

Fast shipping and reliable customer service

Suitable for professional and personal use, especially for users who require smooth and clear handwriting for record keeping and annotations

Product dimensions may vary by ±1 mm; actual product should be referred to for precise measurements.