The surface is made of silk processed cloth, ensure that mouse moves very smoothly.The bottom is made of natural processed rubber, this gives flexibility to adapt to desktops from different materials. Anti slippery, environment friendly and last long. Use super fine and high density material. Waterproof and easy to clean. Reinforcement process on the edge.This is to prevent from deformation, broken or damage due to pulling or aging. Advanced multi-layer integrated process.High flexibility, anti curling and pulling. Only 5mm thick, hard on top and soft at the bottom.Adapt to all different kinds of irregular surfaces.