This is a 3-Ring Piston Ring Set for 1275 A-Series with AE piston @ 21250, 21251, 21252. Please check ring thickness, 1st-ring 1.50, 2nd-1.50, 3rd-4.00. These are cast iron alloy which seats well and has a long rings life unlike chrome plating which much harder on the cylinder and is more difficult to seat. Please use the pull down menu to choose ring size.