Material: Stainless steel, piano wire, plastic; Compatible balls: Golf ball, table tennis (ball diameter from 1.4 to 2.4 inches (3.5 to 6 cm)); Ball collector can easily and efficiently retrieve the ball by simply rotating the sphere. The ball can be easily retrieved without damaging your waist or knees. The handle is made of stainless steel, so it is durable and will not rust. The piano wire used on the sphere is resistant to wear and has excellent elasticity. ● Works great in the green or at home garden to retrieve balls that have been transported to.