Wilson Sensation Plus Black 16 Tennis String cf type men's clothing Long lasting play is now W10801L7 B 7 Long lasting play is now possible thanks to the Pro Penn Marathon Extra Duty Tennis Ball available in a convenient case for teams clubs and individuals The longest lasting Penn ball to date this one features Encore technology to give the ball 22 percent longer life while the LongPlay felt can withstand any punishment This case of Marathon Extra Duty balls contains 12 cans of three balls each for a total of 36 balls designed for maximum playability on outdoor hard courts This ball is approved for play in both USTA and ITF competition It all comes with an elegant and high performing signature design with the subtle Tecnifibre emblem in grey and matte black Sensation Plus takes the highly elastic nylon fibers present in Sensation and wraps them in metallic ribbons for elevated comfort and durability this string is a great value option for beginner or intermediate players who would prefer not to break the bank