Features Enter your model number to make sure this fits. Low compression training tennis ball 75 percent slower speed than a standard tennis ball 36 ball bucket Can be used on any flat surface Description Product Description Gamma Quick Kids 36 Tennis Balls are USTA approved balls for Quick Start Tennis! Great for ages 8 and under on a 36' court. 75% slower speed than a standard ball resulting in longer rallies and more fun for beginners. Bucket with lid and handle for easy carrying.