Features: 1.Designed to be placed under a piano's legs to protect floors and carpets, metal and brass wheels from rust or tarnish. 2.Anti-slip EVA pad at the bottom can prevent the piano from sliding and play a role of cushioning and shockproof soundproof. 3.Selected high quality hardwood, no splicing, hand polishednatural wood grain beautiful atmosphere, delicate more durable. 4.They also work as heavy wheel chair floor protectors and bed leg floor protectors.(Mind the inner size before purchase if you will use them as chair/bed/sofa leg protectors.) Note: The natural wood texture makes each piano caster cups slightly different in texture and color, this is normal. Specification: Specifications: Caster cups for upright piano, pack of 4pcs. Color: Wood colour Size: Bottom diameter 10.2cm / Slot diamet Package Contents: 4pc solid wood piano floor mats Contains only the above package contents and does not include other products. NOTE: Lighting and different monitors may cause the color of the item in the picture to differ slightly from the actual item. The measurement error is +/-1-3cm.