A cylinder head for version 2 gearboxes. It features a double O-ring for a greater air seal, and features a rubber bumper to absorb the piston head's shock. Made from Anodized Aluminum. Features: * Made of Anodized Aluminum * Compatible w/ Version 2 Gearboxes * High Density * High Strength Shock Absorbing Rubber Bumper * Double O-ring for Perfect Air Seal * One Piece construction for durability