Our exclusive active cell-rubber cover combines unrivaled softness with a tacky grip for superior control. Ultra-Wound™ nylon windings provide optimal playability and shape-retention, true bounce, and a longer life. Butyl bladder with no-leak inflation valve. Official size and weight for Men's, 7.3" (18-1/2 cm) dia, and Women's, 6.7" (17 cm) dia. Set of 6 includes 1 of each Rainbow® color.