This is a decision that your coach or manager get to decide for you if you are part of a team. Your own ball is one thing that you have control on. However, when it comes to what the team should play with, it is the manager’s job to pick which ball is the best, and what is appropriate for the team for training. Coaches usually stick to training match balls as they give the illusion of actual match balls.
Size 5 is the official size for professional matches. Therefore, this ball is only available in this size. Do not use this soccer ball on concreted areas. Its unique rubber uses Puma Airlock Valve Technology (PAL) in order to facilitate proper airlock technology. This ball features Perimeter Balance Technology (PBT) which enables it to maintain impressive flight characteristics. https://www.youtube.com/watch?v=j2Xn84L3Kcs