This listing is for one set of brand new CP-Carillo Pistons for Harley Davidson Twin Cam 107 CI 3.937" Bore x 11.0 Compression PAIR 

Included = 2x Pistons + Pins + Locks + Rings 

Bore Size = 3.937" 
Compression = 11.0 

Part Number = BHM107-6-SET