1 complete cylinder set of piston rings for CP Pistons brand Raptor 660 Standard Bore piston, 100mm bore size. Includes top ring, 2nd ring and oil ring. High performance and racing rings fit CP Pistons brand piston part number M1015A. Fits only pistons with "A" suffix. If you have an older Raptor 660 big bore CP Piston without the A suffix please contact us for assistance.