The U23 profile is slightly smaller than the K66. It is primarily found on Valley coin-op tables and few others. It is not that common.
They are full gum-rubber, A-grade cushion quality.
Used on Valley coin-op tables prior to 1989.
Measures 1 1/16" x 1 1/8".
Sold in sets of 6, 42" per piece.
Control fabric on the top and back.