Summit 81113 Mini Viper SD Wgt 18lb Dead Metal Sound Deadening Technology works by filling in critical parts of the platform with a custom engineered expanding foam to reduce unintentional noises caused by movement QuickDraw Cable Retention System once the cable is sized for the tree diameter, all you have to do is insert the cable into the QuickDraw bracket of the suspension arm, pull the "trigger" and the cable securely locks into place (no fumbling with pins, knobs, nuts) SummiLokt precision welding provides maximum rigidity for safety and strength Rapidclimb climbing stirrups are ergonomically shaped and adjustable to fit any boot Comes complete w/ a 4 point safety harness