The base is made of high-quality plastic, robust and durable, the tennis rubber rope is highly elastic and with an exquisite design and fine workmanship can be worn. The ball is attached to a strong, elastic cord, length: 3.8 m, which can extend up to 4--8 m. Equipped with a robust non-slip universal base. It can provide a stable support for training as the base has a valve for introducing sand or water to increase weight. Easy to use and convenient for training without picking a ball, and it's light and portable, useful for individual practice. Great gift for your friends, family members and children who love to play tennis, suitable for many places like garden, park, etc. Product descriptions Specifications: Material: plastic + rubber Color: Blue The tennis trainer gives you the opportunity to practice your tennis skills in the smallest of spaces. You can use it to train and improve your tennis serves. The ball is attached to a strong elastic cord that can stretch up to 4-8m and equipped with a sturdy universal non-slip base, the concave part for placing the tennis ball, convenient and practical to use. The tennis trainer gives you the opportunity to practice your tennis skills in the smallest of spaces. Package included: 1 x Tennis Trainer Base 1 x ball with rope