Piano Caster Cups Grand Piano Caster Cups Wood coasters Cups Piano Caster Pads for Grand Piano Made High Quality Duty 100% Rosewood Material Designed for use with grand pianos Designed to be placed under a piano's legs in order to protect floors and carpets Underside of Each Cup is Lined With Felt Pad, Have Sound-Proof -Antiskid- Vibration free chassis Effect Protects Wood and Carpet From Caster Damage Annatto made, since red wood tree every different part color difference, so each castor cups will have different color, each batch production will have this belong to the normal color differences.