Features: The product not only won't scratch mouse pad, but also makes the movement of the mouse smoother and more stable to the Rounded Edges mouse skates of other makers. The material of the product base of PTFE. Achieve precise and comfortable operation on different materials mouse pads such as cloth or nylon. Reduces the friction between the mouse and mouse pad.Provides a smoother gliding experience. All the useless scraps mouse skates are pre-removed for easier use. Strictly designed according to real mouses,after consider the mouse sensor's durability and accuracy carefully,the shape, the thickness has been adjusted for every model. Package Includes: 2Set x Mouse Feet Mouse Skates Specifications: Material: PTFE Size: 4.1x2.6cm/1.61x1.02inches Colour: Black note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!