Material:Rubber, wear-resistant and durable.Includes 1base,2 tennis rebound balls with string,2 clips.Fill the base with water to increase the weight so it can be heavy enough to hold your swing, and the weight can be up to 1kg.You can use it to practice tennis skills with yourself and release stress.It's perfect for tennis beginner,We are also sales for Tennis racket,For more details please contact sales.