These are action adjustment saddle risers with a "U" tip which rides in the "U" groove on the tremolo body top. The other saddle riser uses a "V" tip and rides in the "V" groove on the tremolo body top.
Length: 0.0000 in Width: 0.0000 in Height: 0.0000 in Weight: 0.100 oz Packaging: 0.0000 kg Units in box: 1