Here are two reseal kits that are correct for the Crosman Mark I & Mark II CO2 pistols. They include the most common O-Rings that are needed to bring your pistol back to life. Enough for two reseals. The kits include: (2) Tube Cap/Piercing Knob Seal (White Urethane O-Ring) This white urethane seal is widely regarded to be of the highest quality and most durable available for your CO2 tube cap application. (2) Valve Body Seal (O-Ring) (2) Piercing Pin Seal (O-Ring) (4) Breech Bolt Seals (O-Ring) (Smaller one is for Mark II (.177 CAL) and the larger one is for Mark I (.22 CAL) (1) Factory Service Manual With Exploded View, Instructions & Trouble Shooting For Mark I & Mark II - Clean COPY (1) Seal Identification Guide (Identifies each seal, it's part number and where it is utilized) Thank You.