Each of these four threaded steel canisters contains 16 grams of 100% pure high-velocity CO2 gas. In just a few seconds 8-9 lbs. of inflation is discharged into your tire. The re-usable valve adapter has solid brass fittings. ATVs and rider mowers will generally use just one canister to fully inflate the tire. On a full-dress touring motorcycle tire, it will generally take all four canisters to reach 24 - 32 lbs. of pressure depending on the size of the tire. This kit is for use on motorcycles, ATVs, Golf Cars, Lawnmowers, and small utility tires.