Features Sponge material, with buffering function, can effectively reduce the damage of vibration to the product. Shake-proof and noise reduction, easy to install. Magic adhesive patch bottom, convenient to use. Four types of cushion pad for your choice, meet your different needs. Especially suitable for pneumatic and electric type of self-cleaning polishing machine and grinding machine. Features: Sponge material, with buffering function, can effectively reduce the damage of vibration to the product. Shake-proof and noise reduction, easy to install. Magic adhesive patch bottom, convenient to use. Four types of cushion pad for your choice, meet your different needs. Especially suitable for pneumatic and electric type of self-cleaning polishing machine and grinding machine. Specification: Material: Sponge Weight: Approx. 20g/0.7oz Diameter: 150mm/5.9inch Thickness: 11.5mm/0.5inch Hole Quantity: 6 holes, 9 holes, 15 holes, 17 holes (Optional)  Package List: 1 x Soft Sponge Pad Package List