Franklin’s official size Probrite Neon Rubber Tee Balls can be used for anything from practice to games. With bright, optic color combinations, these waterproof, 100% rubber balls will help work on hand-eye coordination and will get you ready for the next level. All rubber neon 9" tee balls feature solid rubber sponge core and are available in neon red, neon blue, neon green, neon yellow and neon orange.