The Rope Logic Safebloc Ultra Sling is a fast and simple tool for adding friction to your rigging system at the top of the tree. Made with super-rugged 3/4 in. Tenex-Tec and spliced by the experts at Rope Logic. The Ultra Sling gives you the ability to quickly cinch down on a trunk by passing the Safebloc through one of the 7 spliced pockets. Once choked, you can control the friction by passing the rigging line through one, two, or all three of the holes in the Safebloc. Only designed for use in the choked configuration and MBS in choked configuration is 21,000 lbs.