Black plastic humbucker mounting rings. These are flat base type with slanted sides. Bridge ring tapers from 7mm on thicker edge to 5mm.
2Pcs Pickup Mounting Ring Flat Bottom Metal Humbucker Pickup Mounting Ring Cover
Black Curved Bottom Humbucker Pickup Mounting Ring Set for Epiphone Guitars by VINTAGE FORGE | HR1800C-BLK
Humbucker Pickup Mounting Ring Surround Flat Bottom PR005 – Cream, Black
2x New Metal Humbucker Pickup Mounting Ring Surround (BLACK)
Humbucker Pickup Mounting Ring Surround Flat Bottom PR001 – Cream, Black