ATAIRSOFT Tactical Helmet Balancing Weight Bag Counterbalance with Five Counter Tactical Helmet Accessory Pouch for OPS Fast BJ PJ MH 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 be customized with less weight. Made by Durable Artificial Leather, Nylon, Plastic. Simple to install, unscrew two large screws of the helmet, stacking screw. Designed for helmet equipped with use. Must install behind the helmet increases weight, maintain your helmet in balance.