Designed for a wealth of core exercises to improve balance, strength, and flexibility, the Champion Sports FitPro Training and Exercise Ball is a great addition to any workout regimen. Made from high quality Italian resin, this exercise ball is durable enough to withstand daily use, and the exterior feels soft against your skin. At 20.87 inches (53 cm) in diameter, this exercise ball is designed for people ranging from 5' 1 to 5' 6 inches in height. This ball improves, maintains, and strengthens hard-to-reach core muscles and is made from high quality Italian resin materials for a soft feel. Burst resistant for increased durability during exercise routines. Details:Royal Blue 20.87" (53 cm)1 ballRecommended height: 5' 1" - 5' 6"Burst resistantRubber