This is an anti-virus and anti-bacterial practice ball. The J top training ball has been designed to be anti-virus and anti-microbial with the same feel of the hitting ball. You want to enjoy table tennis in a clean environment! "Medicano-Coat" with an antiviral and antimicrobial treatment made using nitaku (Medicano-Coat) proprietary technology uniformly coats a variety of functional inorganic materials less than 10 nanometers in particle diameters, this anti-virus and antimicrobial coating keeps the surface clean. (There is data tested for long-term effectiveness by a third-party agency) The material features are flexible, yet highly impact resistant, so it wont break easily. The ball features stay stable since it does not change over time. Low water absorption rate, so it is hard to absorb sweat, etc., and it reduces the change of weight and hitting feeling. Practicing with a ball that is similar to NITAKUPRA 3 Star Premium material will help you stay in the game! This is a small quantity pack that is just right out of the box. The ball is the same as the product in the package.