These rubber replacement cushions are an ideal match for worn out cushions, offering a look and feel that's nearly identical to the original. Sold in a set of four they are designed to fit Singer Models 221, 222, 301, 353, and 354. Note that this cushion will not fit Singer's White 221 model. They measure 5/8" in diameter and 5/16" thick, with a color of black and part # 45780.