The GFC34 Fuel Cell is designed to work with the GCN150 gas-actuated concrete nailer as well as with most major brand gas concrete-nailer tools (TF1100). The fuel cell offers 1,300 shots and can operate at temperatures as low as 20_ F. Fuel cells are offered in 2 pack clamshells, and 1 fuel cell is included with each pack of 1,000 pins. Each fuel cell is 34 grams.