Rinastore Upright Piano Solid Hardwood Caster Cups Pads - Set of 4 (Solid Wood PA-12) HIGH QUALITY WOOD - Made of solid hard wood (WHITE OAK), durable & secure support. ANTI-SHOCK EVA FOAM MAT - Each cup is lined with EVA pad have sound-proof antiskid effect. STRONG & SECURE SUPPORT - Protect floor from scratch causing by piano. PRESERVES ORIGINAL WHEEL COLOR - Protect wheel of piano from rusting or tarnish. PERFECT FOR - For Upright piano stand - SET OF 4(Brown Color).