ACU Stax are multiple chambers of brass nock sets that are used as weights on bowstrings. Each of these Stax are precision machined from solid brass on Swiss-turn machines. Each stack chamber is the equivalent of one red nock set and comes in stacks of 2, 4, and 5. ACU Stax are used by many of the top bowstring manufacturers in the industry and are designed to be crimped on the bowstring. ACU Stax are sold individually.

• Precision machined from solid brass on swiss turn machines
• Crimps on to bowstring for easy install
• 2 Stax = 15 grains each
• 3 Stax = 22.5 grains each
• 4 Stax = 30 grains each
• 5 Stax = 37.5 grains each