• Designed to be put under each grand piano leg • Raises grand piano no higher than standard casters • Equipped with American Made rubber wheel casters • Sold in sets of 3 • Available in Black only • Remove original piano casters before installing • Square Dollies measure 3 1/8” x 3 1/8” I.D., 1 3/4” Deep • Round Dollies measure 4 1/8” I.D., 1 1/2” Deep