This heavy-duty explosion-proof fitness training ball has different sizes and colors, so you can freely choose it according to your height. The ribbed surface of the ball is very stylish and beautiful, and the salient points provide excellent grip for safer use. The unique explosion-proof technology ensures that it can withstand years of regular use, and the ball has a high load capacity, which can withstand 400kg of weight by test, and will slowly deflate when punctured. It is environmentally-friendly material for more peace of mind during training.