The ACU Stax Machined Brass Bowstring Weights (10-Pack) are precision-crafted brass nock set weights designed to enhance bowstring stability and performance. Machined from solid brass on Swiss-turn machines, these weights provide consistent and reliable tuning for optimal shooting results. Available in stacks of 2, 3, 4, or 5, each chamber corresponds to the weight of a standard red nock set, making them a trusted choice among top bowstring manufacturers. Designed to be crimped onto the bowstring, ACU Stax offer an effective way to fine-tune arrow flight and enhance consistency in both competition and hunting setups.