Only the Two Striper diamond bur is manufactured with the P.B.S. diamond-particle bonding process. P.B.S. braze is a bonding process that maximizes the exposure of diamond-cutting surfaces especially at the tips and upper circumference of the diamond instrument where most cutting occurs. Crystals, placed evenly and precisely in a uniform matrix, are fused permanently to a surgical-grade stainless-steel shank; they are guaranteed not to fall out - Round