Item Name: Indoor Professional String Elastic Rope Tennis Training Ball Practice Rebound. Material: High quality rubber and woolenAdvancing deformation: 0.23-0.27N Diameter: 63.5-66.7mmWeight: 56.7-58.5gElasticity: 138--147cmDescription:It takes up small space, and can be used on outdoor or indoor, easy to carry.It can have the same effect with the original one.It is used for tennis training. Package Included:5 x Tennis Ball with String (without other accessory) 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. *Please make
