Polycarbonate (Stronger Than ABS) Gym Gymnastic Rings Adjustable Straps Crossfit Strength Training Ring Material: Polycarbonate (PC) 63% stronger than ABS Max load 250 kgs (550 lbs) Non slip surface treatment Dimensions: 9.25" external diameter, 7" internal diameter Nylong webbing metal cam buckled straps are 1" x 15 foot long adjustable to accomadate different athlete heights and workouts, free carry bag