Built with hook and loop straps rubber and durable ABS polymer Sling mount attaches through the strap of the back pack and can be tightened and secured Rubber mount provides a good, fastened seal Can accommodate different sized backpacks and slings Features a quick release for the sling mount In the Box 1X Hand free Sling Mount Specifications: Brand G-Force Build Hook and Loop, ABS Polymer, and Rubber Compatibility Almost all Backpack straps Color BLACK California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov