Unique 18 panel design Exclusive composite cover The Mikasa Volleyballs feature has an exclusive composite cover. It also features a unique 18-panel design. Model V330W has a nylon-wound center. It is the club version of the FIVB game ball. Its official size is 5. Model V300W has an aerodynamically designed construction. Its single Dimpled Surface minimizes the air resistance and maximizes the grip power of the ball surface. It makes use of original Microfiber + PU material to create the highest quality volleyball with Anti-sweat functionality. It features a size of 65-67cm and a weight of 260-280g.