Item Type: Tennis trainer Main Material: Plastic Base Size: Approx. 21x20.5x4cm / 8.3x8.1x1.6in Weight: 195.00g/6.87oz Package List 1 x Tennis Ball 1 x Base 1 x Hook 1High Stability: There is a valve on the base to put sand or water to increase weight; The side is also provided with a small ring for hanging the belt, and the concave part is used for placing tennis balls; It can provide stable support for training. 2Product Function: The product is easy to use, without picking up the ball; Moreover, it is light and easy to carry, which is very suitable for single person practice; It can also improve your attention, movement ability, coordination ability of hands and eyes, and develop your interest in sports. 3Practical Design: It adopts anti skid hole modeling design, which can be filled with heavy objects for training; Its semicircular ball structure makes the ball easy to attach; The wall mounted traction rope design is helpful for cleaning. 4Convenient to Carry: The product is small in size and light in weight; Users can take them to any indoor or outdoor open place to practice tennis skills. 5Applicable Situation: Users can use elastic rope to tie the ball to the base to practice tennis skills; It is not limited by the venue and is suitable for tennis courts, basketball courts, gardens, parks, garages, basements, fitness rooms or other open places.