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Weight: - Total system weight is about 300g. - Weight bags can also be equipped with batteries if you take out the weight. - Each of counter balance weight is about 50g and can adjust as needed. Material: - Made by Durable Artificial Leather, Nylon, Plastic. Installation: - Easy to install, Unscrew the helmet behind the two large screws, install weight package the counterweight tighten - Install behind the helmet increases weight, maintain your helmet in balance when using night vision goggles on the airsoft helmet.