Xiaomi Mi Aluminum Rollerball Pen adopts switzerland imported refill, delivers a 0.5mm nice dark, and smooth writing without fading, smudging. Its all-metal design, 180 degree rotate-able design and the 9.5mm pen tube makes this rollerball pen the best choice for stationery and office supplies. Switzerland Imported Refill smooth writing and smear-proof, retractable. Diameter 0.5mm Pen Lead 0.5mm fine point draws razor-sharp, consistent lines Diameter 9.5mm Pen Tube 95.mm pen tube with textured grip provides exceptional writing comfort and control. 180 Degree Rotate-able Pen Handy retractable and rotate-able design, convenient to use. All-metal Structure Aluminum alloy body with zinc alloy pen clip is great for superior resistance and durability.