Humbucking pickup ring set - Neck and Bridge, flat bottom, slanted, Black plastic. Outside dimensions - 3-17/32" x 1-25/32", Inside dimensions - 2-3/4" x 1-1/2". The low mounting rings are for the neck position. The height tapers from 3/16" to 1/4". The tall mounting rings are for the bridge position. The height tapers from 3/8" to 7/16".