Specification: Material: Birch wood, Nylon strap, Iron buckle Outer Diameter: 9.25 inches (23.5cm) Inner Diameter: 6.7 inches (17cm) Ring Thickness: 1.25 inches (3.2cm) Strap Width: 1.1 inches (2.8cm) Strap Length: 14.7ft (4.5m) Weight Capacity: 1100lb (500kg) Package Includes: 2 Pieces Birch Wood Gymnastic Rings 2 Pieces Nylon Straps with Buckles The rings are made of premium quality birch wood, straps are made from high density nylon, which is durable and skin-friendly, easy to set up, use and adjust. Size of wooden gymnastic rings and straps: outer diameter: 9.25in, inner diameter: 6.9in, ring thickness: 32mm/1.26in(as you choose), 14.7ft long and 1.1in wide straps. Our maximum load capacity of exercise rings are 1100lb(500Kg). They are strong enough for any people with any body sizes, a great home gym substitute for body exercise in no time. Just hang the rings around a strong steel, slide the sling from underneath the buckle and adjust both straps to be the same height. Then you can enjoy your training. The gym rings enable you to do any kind of exercise such as , dips, rows, and muscle ups. No matter men, women or kids and even the old can use them easily and safely.