XUEMEI Piano Caster Cups - Can securely hold and support your piano for years of use. Also work for heavy wheel chair leg protectors and bed leg floor protectors. Floor Protectors - Designed for Piano stand, these piano casters are to be placed under a piano's legs in order to protect floors, wood, tiles and carpets. Anti-Corrosion - The piano casters protect pianos metal and brass wheels from rust or tarnish. Package includes 4pcs of piano coaster cups. Long Use Time - 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: Designed to be placed under a piano legs in order to protect floors and carpets. Heavy duty advanced plastic design. Designed for use with pianos. Protects wood, tile, and carpet from piano caster damage. Color: Black Outside Diameter: 88mm Inside Diameter: 63mm Package Weight : 3.17 Ounces Package Include: 4 x Piano Caster Cups