Square, yet classy! These plugs are made of gorgeous black stone shaped into a square pyramid design. But don’t worry, the wearable portion is still a comfortably smooth, circular shape. The single-flare plugs are sold in pairs, and come in any of the following many sizes: 4 gauge (5mm), 2 gauge (6mm), 0 gauge (8mm), 00 gauge (10mm), 1/2 inch (12mm), 9/16 inch (14mm), and 5/8 inch (16mm). We also offer you to choose from 3 other styles for these plugs.