The Quality Archery Designs Ultrarest HDX Drop-Away Arrow Rests has all the great features of the Pro HD (including Velocity Drop-Away Technology which ensures the rest falls away only when the bow is fired) plus a sleek, curved capture bar and AVT (Advanced Vibration Technology) for a quieter shot. Easy to adjust timing cord allows you to fine tune your shot. Built from precision CNC aluminum and stainless steel. Vertical, horizontal, and overdraw adjustments. Velocity Drop-Away Technology Injection-molded rubber thumb wheel Sleek, curved capture bar AVT (Advanced Vibration Technology) for a quieter shot Easy to adjust timing cord Built from precision CNC aluminum and stainless steel Vertical, horizontal, and overdraw adjustments