Prima's Muay Thai Original Style Jump Rope Best for Boxing martial arts Cardio Cross Fitness Training and Lose Weight Prima Muay Thai original style jump rope, Strong and heavy for Muay Thai, Made to meet and supersede serious Muay Thai workout requirements Great for cardio vascular exercises, this aerobic exercise can achieve a burn rate of up to 700 calories per hour of vigorous activity, with about 0.1 calories consumed per jump Lathe wood grips, Stainless steel bolt and a strong plastic rope, they are durable enough to withstand the punishment of serious MMA workouts Size of rope: Diameter 1/2 inch (1.27 cm) and Length 8.90 foot (270 cm) without bearing, Length adjustable with Stainless steel bolt