This is a single pack of complete o-rings to rebuild a Fusion AP gun. These o-rings are all black Viton. They are designed to handle any pressure or temperature that a Fusion gun can give them
Their only weakness is solvent. Lets face it, it's better to replace you o-rings every time you clean your gun instead of putting it back together, hoping all your o-rings are still good!
IF YOU USE SOLVENT PLEASE ORDER 246355SR