Gymstick Power Rings are made of laminated hardwood. The wood material allows for a pleasant feel and good grip even in hard workouts. Highly durable and easy-to-use numbered straps allow for safe and effective training. The package includes 2 rings and 2 durable and adjustable straps with a quick release. Maximum strap length 2.5m. The diameter of the tire is 23cm. Maximum user weight 180kg.