Lucite 4 1/2" Black Caster Cup
These Black Lucite Piano Caster Cups are manufactured in the United States, and made of lucite, a near unbreakable acrylic product. Measuring 4 1/2" on the outside diameter, and 2 3/4" on the inside diameter, these caster cups are perfect for upright pianos. Because of lucite's strength, the caster cups are able to be thinner on the bottom (whereas obviously with wood, you would need it to be thicker or it would crack). The thin, flat bottom of these cups will greatly enhance the beauty of your upright piano.