The pad is covered with strong anti-skidding function that effectively helps it stay in place. Protects metal and brass wheels from rust or tarnish. Caster cups designed to protect your hardwood floors, rugs and carpets. Will not tear or distend surface under the piano weight maintaining a proper pedal height. Features - Color: Black+White. - Material: Plastic. - Size: About 8.6 x 8.6 cm. - Solid plastic made Piano Caster Cups features corrosion resistance and strength that can securely support your upright piano for many years of use. - Designed for Upright Piano stand, these piano casters are to be placed under a piano’s legs in order to protect floors, wood, tiles and carpets. And help maintains a proper pedal height. - The EVA mat under the wood cups absorb vibration and reduces noise without scratching hardwood floors. - Elegant design enhances piano and room beauty providing a real classy look. Package list: 4 x piano foot pads