The Tecnifibre X-One is a high-pressure competition tennis ball supplied in a can of 4, designed for advanced and competitive players on all court surfaces. It features Tecnifibre's X D-Core technology, which reduces ball deformation during play to keep the core in shape longer for consistent feel and durability. • 4 balls per can • High-pressure competition ball with X D-Core technology • Suitable for all surfaces • ITF/FFT approved