Totem Tennis Ball Replacement Backyard Tennis Trainer Spare Ball Hook String - 3x Features: -Be ready for the court in no time. Attach this replacement ball to your tennis trainer to improve your game and build your speed, hand-eye coordination and stamina. Specifications: -Material: Rubber and Felt Ball and Steel Hook -Dimensions, Size: 11cm L x 18.5cm H x 6.5 W -Colour: Yellow Package Inclusions: -3 x Tennis Ball Replacement Notes:-Actual colors may vary due to computer monitors displaying colors differently. -Due to the nature of the manufacturing process and manual measurement, product sizing may vary slightly.