Black Gymnastic Rings (28mm) with 15ft or 30ft Adjustable Straps (1 Pair Rings + 1 Pair Straps Bundle) / Muscle Ups, Ring Dips, L-Sit, & More / Strength Training, CrossFit, Gymnastic Equipment A pair of 28mm high impact black plastic gymnastic rings. Length markings for every 3". Numbered at each 12" mark. 15ft or 30ft of 1.5" polyester webbing + 1 aluminum motorcycle-style cam buckle. Easy to use cam buckle to adjust ring strap.