Features: High Capacity 25 Gram Threaded Cartridges Fits All CO² Pumps That Accept 16G Threaded Small, Compact, Easy To Use Pack of 4 Due to air freight restrictions this product can only be shipped to the USA (excluding Hawaii & Alaska) Risk-Free Purchase - State Bicycle Co. offers FREE EXCHANGES* -If this item doesn't work out, we'll send you a return label and exchange for free!