Fully integrated into the stock, the ACUdraw 50 has taken the leveraged, 50% reduction rope-cocking concept to an easy-to-use level. Its cord/ropes retract neatly inside the unit&';s housing after cocking. Lightweight, contoured covers provide improved security of the unit and its cord/ropes when not in use. No storing a cocking rope, untangling it, or putting it away after each use. NOTE: Not for use on ultra-narrow or reverse-draw crossbows.