[feature] Product material: These mouse sandpapers are made of aluminum Oxide abrasive, durable and antistatic, ideal for general grinding, polishing and sanding. The larger the particle size, the finer the polishing effect. Velcro Backing Design: Each piece is designed with hook and loop velcro backing, easy to install and remove, durable and practical, can be anti-static and anti-clogging. [product information] Product name: 60 grinding sandpaper color: red Material: Mineral Sand Dimensions: 90mm or 3.5" each side Packing list (available after purchasing a product): 60 grinding sandpaperx50 beg to be excused: 1. Due to the long shipping time, the item may be damaged during the transportation, if the item is damaged, please leave us a message through the official website immediately before leaving a comment, and I will solve the problem for you. 2. Due to manual measurement, the size may have an error of 1-3cm. 3. Color may vary by monitor.