Mitre Arena Nylon Wound Basketball Black/White/Silver Outdoor Training Equipment. When it comes to Basketball equipment, you need to know that you're buying quality products that perform well in all settings, and are built to last. You can rest assured that this training ball is built for durability, on all surfaces. With a Butyl bladder for maximum air retention and minimum maintenance, Mitre basketballs are ideal for clubs, teams, schools and groups, as well as individuals who want reliable basketball equipment that they know isn't going to let them down. Ideal for indoor or outdoor use, this deep seam moulded basketball is designed for dealing with high wear and tear situations, such as concrete courts or wooden surfaces.