These Pop-Up Targets attach to the tennis net with Velcro in just seconds. Pop-Up Targets help focus service practice and lead to the improvement of many other strokes, including passing shots, service returns and more. These colorful targets are made of impact resistant nylon with a durable metal frame. The opening of each target measures 19" x 22". The Pop-Up Targets fold into their own compact 15-inch diameter nylon case for easy space saving storage. This set includes one red target and one blue target.