Weight: Approx. 30g,Material: Nylon + PC. + Aluminum.Lightweight, durable, multipurpose.Allows for low-profile, ultra compact mountingRotation: 90 degree.Compatible with helmets(fast, AF,M88, mich...)outfitted with an NVG mounting plate.When night turns to day,and your NVG (night vision goggle)plate is naked,dress it with your GoPro HD Hero or Hero2 camera and get some sick,high-octane footage with the securing NVG Mount, including mounting plate and thumb knob.Cover your head and all the action.NVG mounting plate and thumb knob secure your GoPro HD Hero camera for hands-free,head-protecting operation.Application: Airsoft or wargame Gun competition, Live CS game, Tactic game,Nerf gun battles, Survival game. Note: The data are all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.