Tuflex Roundslings are high abrasion-resistant, incredibly strong slings designed for easy use and storage. The secret to their strength is the low stretch, continuous loop polyester (nonwoven) core that carries 100% of the load. All slings are covered by 2 layers of Tufhide nylon, for outstanding handling, comfort, and wear resistance. Unlike steel cable, Tuflex lightweight slings are not abrasive to the user's hands or the surface that they are lifting. In a patented process, the polyester cords inside are made seamless, so there are no knots to rupture. Each sling has a stitched-in Tuftag,designed for lifetime identification of strength,serial number and date of manufacture. If the jacket is ruptured, red core yarns provide a visual signal to the operator to retire that sling. Tuflexslings will fit through the gate of (most) steel carabiners or rigging clevis, thanks to their unique core construction.