1 Material:PU leather 2:dia35cm can load 2--15kg (with sponge ,clothes,sands ,iron sands) three ball may help you interact the entire physique in a high-intensity exercise that builds strength, cardio and explosive power four wall ball are a handy tool for complete body workouts, supreme for exercises of core muscles, arms’ energy in coordination with upper back, knees, abdominals, and shoulders 5 Package no longer included sands ,empty ball solely fill all yourself and it's easy