You can practice volleyball by yourself. This volleyball exercise belt from SunSlow is a volleyball practice equipment that allows you to easily serve and practice spikes on your own without any time or location. The ball is bounced back to you with the elastic strap so you can practice more efficiently without chasing the ball. If you are looking for a volleyball practice tool, this is the perfect choice. Suitable for a wide range of uses, from children to adults. This exercise belt can be adjusted from 17.7 to 35.4 inches (45 to 90 cm), so it can be used in a wide range of ways, from children to adults. It is compatible with both No. 4 and No. 5 balls, so it is recommended for club activities. Wide straps for added durability. The elastic strap is wide enough to not get in the way of practice, making it more durable. The length of the strap can be adjusted between 35.4 - 70.9 inches (90 - 180 cm), so you can practice the appropriate length for yourself. Product Specifications: Waist belt size: 17.7 - 35.4 inches (45 - 90 cm); Strap length: 35.4 - 70.9 inches (90 - 180 cm); Compatible ball size: No. 4, No. 5 ball.