Tennis Trainer Portable Self-Training Tennis Tool for Striking Training Swing Description: [Single Tennis Tool] Very convenient tool for practicing tennis trainer swings. The tennis tool that trains and trains is not place/person dependent and accurately simulates the touch, swing rhythm and amplitude of the ball stroke to ensure the training effect. [Practice your reaction ability] Tennis training machine will improve your reaction ability, hand-eye coordination. Master the rhythm of beats and be proficient in forhende and bacon strikes. [Adjustable] The height can be adjusted, which is convenient for practicing hitting at different heights, suitable for children and adults of different heights. [High Quality]The tennis training tool is made of stainless steel and pvc, which are durable. It helps beginners to start learning how to hit the ball. [Training Equipment] This trainer can be played indoors and outdoors, it is a good gift for family members, colleagues or friends. Specifications: Material: metal Size: 70 cm-105 cm/27,56 inch-41,34 inch The package includes: 1 tennis coach