Xtra Performance Compound Features - New ultra high modulus carbon bar, 2x stronger, contains thicker layers of carbon - New wedge lock bow mount bracket is hands down stronger than any other (patent pending) - In-line tension adjustment allows the sight pin to stay on target from shot to shot - Stronger 10-32 windage lead screw - Enlarged diameter windage and elevation knobs with click locks - Thinner, weight-reducing elevation rail - Metal sight tape option for compound models only (8 included, 20 sold separately) - Ultra high modulus 6" & 9" bar available for compound sights the sight tapes are only available in yard measurements