Features: brand new and high quality Strong Support - Plastic made upright piano caster cups. Dimensions: 3.46" outer diameter, 1.3"- inside diameter. Can securely hold and support your upright piano for years of use. Also work for heavy wheel chair leg protectors and bed leg floor protectors. Designed for Upright Piano stand, these piano casters are to be placed under a piano's legs in order to protect floors, tiles, carpets. Non-Slip & Anti-Noise - The caster cups absorb vibration and reduces noise without scratching hardwood floors or wood board. Anti-corrosion - The piano casters protect piano's metal and brass wheels from rust or tarnish. Package includes 4pcs of piano coaster cups. Specifications: Material: Plastic Color: Black/Transparent/White Package Weight: approx.88g Inner Diameter: 3.3cm/1.3in Size: approx.8.8x2cm/3.46x0.79in Note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 4Pcs x Piano Caster Cups