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. 't be fooled by cheaper off-the-shelf caster cups made for household furniture The new and improved design of these caster cups offers an economical, yet durable option for protecting your floors from piano caster damage. These piano caster cups are designed to withstand and support the weight of your piano while protecting your floors. Will work on wood floors, tile floors, and even carpet. Made High Quality Duty 100% Hardwood Material Designed for use with Upright pianos Very elegant design enhances piano and room beauty providing a real look. Comes in stylish gift box making it perfect gift for a beginner or a master piano player. Protects metal and brass wheels from rust or tarnish Color: wood color Material: Acrylic resin Size: Outlet Diameter10.3cm Inner Diameter 5.0cm Weight: 320g ( 4 CUPS) Package Contents: 4pcs piano cups Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.