The Ball Doctor Leak and Flat Fix-Repair Kit by Unique Sports Products helps fix sports balls with leaks and punctures. Works on most valve inflatable balls without a bladder. One syringe is enough for one average size ball (standard basketball, volleyball, football, etc) with minor leaks. Instructions: 1. Insert the syringe tip into the ball valve and depress the plunger. 2. Pump up the ball with air and bounce vigorously for several minutes. *Note: Does not repair a broken valve.