EXTRA LARGE WOODEN GRAND COASTERS - Polished Ebony

Inner Diameter: 4 1/2"
Outer Diameter: 5 5/8"
Thickness (center) 1/2" (Your piano will be raised by 1/2")
Thick Felt: Already installed.
Wood Type: Solid Birch Imported from Germany. Birch is considered one of the harder woods thus making it perfect for Caster cups.

 XX-Large Solid Wooden Caster Cups in polished ebony finish are the best choice for a Grand Piano, with a new design that has three ripples on the side and a wider inner diameter for bigger wheels. The outer diameter is about 5.5" and the inside diameter is 4.25". This item comes in a set of 3 with black adhesive felt. The felt will be easy to slide whereby the rubber makes it harder to slide the piano.