There are many variations of piston rings in both thickness and composition, i.e. dutile iron, stainless steel, etc. There are also various coatings and processes to deal with heat and ring seating such as chrome and moly facing, gas nitriding, chromium nitride coating, etc. The ZL1 Speed Shop can help you choose the right ring package for your engine that will correctly fit your pistons in relation to correct back clearance, land side clearance, and circumference whether it be a 10,000 horsepower Nitro car or a 300hp street rod. Having trouble find the right size rings for your odd size pistons, no problem. The ZL1 Speed Shop offers custom rings set made from raw material made in the USA under tight quality control standards for any bore size or thickness whether 1.2mm, 1.5mm, 2.5, 3mm, 5/64, 1/16, 3/16, .043, or other sizes. Contact us for details!