Ultra Secure Swing Hanger: We provide the thicker tree guard mats for free, they will prevent the sudden breakage caused by prolonged friction. They are easy to attach to the tree with hook and loop, more secure. Strong 304 stainless steel D-ring and carabiner: The 10mm screw-lock carabiners and the 6mm D-rings are all forged from upgraded 304 stainless steel. Don't worry when swinging with our hanging kit. Durable Strap Material: The hammock straps are made of industrial and durable nylon, water resistant and tear resistant. With the double stitches, the straps are stronger and prevent breakage. Suitable for all swings: High-strength rip straps + Stainless steel carabiner / D-rings, the strap swing sets is ideal for tree swings, tire swings, backyard swings, and porch/deck swings, hammocks, and camping. trees (each 79 cm long and 10 cm wide); 2 screw-lock carabiners; 2 long straps (158cm) with D-rings.