Check the listing for details. Fast Tactical NVG Counterweight Kit OPS-Core Helmet Bag Containing 5 Lead Blocks. Condition: New. Listed at 18.99 USD. About this itemHelmet Counterweight – Used to balance tactical helmet when working with a heavy front NVG. Keeping the helmet balanced helps to make your head feel more comfortable and reduce neck pressureAdjustable Weight Blocks – The total weight of this counterweight system is 280g (includes 5 pcs removable counterweight blocks). The weight of each counter block is 50g. It can be adjusted easily as neededDurable Material - Made of durable 500D nylon，PU and plastic. The inner elastic fixed strap can be stretched and it can be used for battery storageEasy to Use – Easy to install and remove, just unscrew the two large screws which behind the helmet then install the helmet counterweight and tighten the screwsFits: This tactical helmet counterweight can fit OPS Core Fast BJ PJ MH and most other fast tactical helmets on the market