Dynamite for your pistons TNT piston rings from Total Seal feature the latest in Hybrid ductile Iron ring technology. The centrifugally spun, heat-treated ductile Iron top ring is specifically designed to withstand the Explosive rigors of nitrous oxide and forced induction environments. They're quick seating, easy on the cylinder walls, and available with optional PVD face coatings for further reductions in friction and increased wear ability. These Total Seal TNT piston rings are available in sets with conventional, gapless top, or gapless second rings, or individually.