Wossner EP3/FN2/DC5 0.25 Oversize Piston Set. These K-series PRB pistons are a identical replacement for the discontinued 13030-PRB-A01 and are of a forged construction. It has a black dry molybdenum film lubricant coating on the skirts for longer wear and less friction, as well as additional oil holes in the ring grooves for better high rpm oil control. These pistons also have holes in the wrist pin bosses to improve wrist pin oiling. When installing these pistons care must be taken to ensure the correct final compression ratio is achieved and that no interference will occur. Complete with new wrist pins and circlips.