Piano Coasters Upright Piano Caster Cups Furniture Legs Pad for Piano and Furniture Leg Casters Plastic Set of 4 Made High Quality Heavy Duty ABS Material Designed for use with upright piano Underside of each cup is lined with felt pad have sound-proof antiskid effect Designed to be placed under a piano's legs in order to protect floors and carpets Protects wood floor and carpet from caster damage black Color upright piano Caster Color is rose color black transparent color marble color optional kagyu, can better with the color collocation