Specifications:- Size: M- Dimension(LxWxH): 10 1/16" x 7 1/2" x 5 1/8" (25.5 x 19 x 13 cm)- Liner Thickness: 3/8" (1 cm)- Cheek Pad Thickness: 1 1/8" (2.8 cm)- Material: Polyester Fabric, Sponge- Net Weight: 0.23 Lb (0.1kg). Package Contents:- 1x Liner- 2x Cheek Pads. Notice: - Please note that this product is not machine-washable. Kindly wash them manually, and air dry them for 24 hours before reinstalling them to avoid dampness or mildew.- Due to the elasticity of the material, the actual thickness will be slightly higher than the provided parameters.