Solid Wood Piano Caster Cups Furniture Round Wheel Cups Gripper Set Load Bearing for Bright Piano 4Pack (black) Designed for use with grand pianos ,with EVA non-slip, shockproof, sound insulation Designed to be placed under a piano's legs in order to protect floors and carpets Made for High-Quality Select Senior basswood pear flowers and trees,absolutely quality assurance There is a little difference color,it is normal Underside of each cup is lined with felt pad