What this product can offer you is that it will holding your piano stably and be anti-slip to use, it will also reduce the noise sound and scratches to your floor and carpet when using, and be shockproof. Comes with mini compact size, which make it be easy to install and can carry it to anywhere to use like performance and concert, it will protect carpet and floor when using. By making with plastic material, this piano caster mat will be solid and wear-resistant to use. The length of the product is 8.7cm, the width is 8.7cm, the height is 2.1cm. It is suitable for protect piano to scratch your floor and reduce noise sound. Item Name: Piano Caster Mat Material: Plastic Feature: Anti-Slip, Thick, Solid Colors: Black, White, Clear Size Details: 8.7cm x 8.7cm x 2.1cm/3.43" x 3.43" x 0.83" (Approx.) Notes: Due to the light and screen setting difference, the item"s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 Set of Piano Caster Mat(4Pcs)