The Wilson Tour Premier All Court tennis ball is designed with the same specification as the AO ball edition to ensure supreme playing characteristics with enhanced durability, proper bounce and excellent shot sensation just to name a few all thanks to the unique woven felt fibre. The ball is suitable for all court surface styles and provides exceptional visibility during dynamic rallies due to the Optivis bright felt. The Tour Premier boasts the seal of approval of the ITF (International Tennis Federation) and its supplied as a 12 dozen set.