S = 6-Pack, M = 10-Pack, L = 12-Pack. Retractable Design: Easy to operate-simply press to extend or retract the pen tip-with each click providing crisp, satisfying tactile feedback. Smooth Writing: Equipped with a fine 0.5mm tip and paired with richly pigmented, pH-neutral ink, these pens ensure a fluid, effortless writing experience with a steady, consistent ink flow. The quick-drying, smudge-proof ink keeps your paper clean and tidy, making these pens an ideal writing tool-particularly well-suited for left-handed writers. Whether at home, school, or the office, they serve as the perfect, indispensable stationery companion. Practical Clip: Easily clips onto notebooks, shirt pockets, or binders the end of the clip features a small rotating steel ball-a clever design detail that adds a playful touch. Weight: 0.26 lbs.