Whitecap 7 1 2" Gas Spring 10lb Black Nitrate [G 3110C]. 7 1 2" Gas Spring 10lb Black Nitrate Features: Black Nitrate Gas Spring Ext. Length: 7 1 2" Comp. Length: 5 1 2" Rod Dia.: 6mm Tube Dia.: 15mm P1 Force: 10 *Gas Spring bodies are constructed of heavy duty steel coated with heat cured black nitrate paint *O ring ensures proper sealing to force oil toward the orifice piston *Hydraulic fluid specially formulated to provide end of travel damping *Piston assembly provides precise control during the extension