Championship Extra Duty 4 Tennis ball Can Size:NO SIZE The balls have a fast Size:5 The balls have a fast Oakley ARO5 aerodynamic and super comfortable design tuned to speed 360 BOA FIT System to set the desired size the highest quality MIPS protection for your safetyProduct specifications lightweight polycarbonate case integrated glasses dock that securely stores and stores your glasses at hand for quick and easy access X Static Filling uses the power of silver to create powerful technology that suppresses the growth of bacteria on the fabric and eliminates odors throughout the life of the product MIPS Brain Protection System: an integrated low friction layer designed to restriction of rotational movement transmitted to the brain from angular impacts on the head BOA FS1 1 System: height adjustable 360 design that provides the best mounting Extra Duty ideal for longer play on hard court surfacesExclusive Dura Weave felt from Wilson provides greater durability and improved performanceIdeal ball for all levels of tournament and recreational playUSTA and ITF ApprovedProduct Dimensions: 28