This tennis ball is constructed with Wilson's regular duty felt, making it best suited for clay and indoor court surfaces. The exclusive Dura-Weave felt exterior delivers long-lasting durability, exceptional performance, and unmatched consistency. The yellow cover provides high visibility from anywhere on the court for lightning-fast reactions during competitive matches. It is an ideal tennis ball for high school and recreational use and is USTA and ITF approved. Available in a Can of 3.