The Speed Studs work to add up to ten feet per second of arrow speed while also acting as a peep sight tuner. Gain up to ten feet per second depending on where you position the Speed Studs (1 for single cam, 2 for dual or binary cams). It aligns the peep sight by simply moving the Speed Stud that is between the separate strands of string up or down to the desired position. Each stud weights 31 grains each.

Warning: Cancer and reproductive harm: https://www.p65warnings.ca.gov/