Rotate cup covers instead of cups. Keeps holes free of top dressing material and debris. Sits on top of the cup, flush with surface of the green. 4 1/4" (10.8 cm) cover is powder-coated steel. 6" (15.2 cm) and 8" (20.3 cm) covers are powder-coated aluminum. 1" (2.5 cm) high 4-1/4" (10.8 cm) diameter