Balanced inline tensioning system keeps your sight in line when adjusting the tension. Ultra High Modulus carbon bar is 2 times stronger and has a higher weight to strength ratio as compared to similar models. Wedge Lock mounting system provides a strong, and precise mount that clicks into place. A superior "Windage Dovetail Guide System" replaces inferior twin-dowel guide systems and provides zero backlash. Elevation and windage locks prevent any movement when locks are activated. Thinner, jeweled elevation bar is lighter and stronger than before. Larger knurled elevation and windage knobs for easier adjustments. Allows you to add metal sight tapes for precise yardage marks (7 sets included). All other sight scales are sold separately. Included Sight Scales: 9 and 10, 13 and 14, 17 and 18, 21 and 22, 25 and 26, 29 and 30 and 33 and 34.