TypeA: Tennis Training Tool Exercise Tennis Ball Self-study Rebound Ball Trainer Baseboard Features: 1. Anti slip hole molding design, can fill in the heavy objects to train. 2. Using PE environmental material and High temperature forming technology to make the base more durable. 3. Semicircular ball groove structure, make the ball easily to be attached. 4. Widing towing rope groove design, which is useful for its sort out. 5. Portable handle design, giving you a comfortable using experience. Specifications: Material: PE Product size: approx. 245*205*70mm/9.6*8*2.75'' Include: 1 x Tennis Training Base board Type B: High Quality Rubber Woolen Training Tennis Balls Trainer Tennis Ball with String Features: 1. It takes up small space, and can be used on outdoor or indoor, easy to carry. 2. It can have the same effect with the original one. 3. It is used for tennis traning. Specifications: Advancing deformation: 0.23-0.27in Springback: 2.5m/8.2ft free landing Springback: approx. 1.4m/4.59ft Material: High quality rubber and woolen Include: 1 x Tennis Ball with String Note: Please allow 1-3mm differs due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding.