Gain up to 10 fps of arrow speed using these Speed Studs that also double as a peep sight tuner. Use one stud on
single-cam bows or two on bows with dual or binary cams. Simply move up or down on the string into desired position. Per 2. 31 grains each.
I just put the speed balls on my bowtech destroyer 350 today and did not pick up any speed. As a matter of fact I lost 1 fps and gained lots of noise. Sending back to cabelas tommorow.