Cap for Co2 Threaded Cartridge

Cap for 16g or 20g threaded Co2 cartridge.I generally carry two cartridges in my bike's seat bag and I noticed that over time the sharp threads were damaging the inner tube stored in the same bag.These caps solve the problem, protect the threads from dings and also protect the top of the cartridge from accidental punctures.Textured and with a small projection so they can be undo easily even when wearing gloves or with cold hands.