Rubber Volleyball Official size and weight Suitable for indoor/outdoor use Delivered deflated OFFICIAL SIZE & WEIGHT: The size & weight used at the pro level, ideal for ages 11 and up. SOFTER FEEL: Sponge-backed rubber cover creates a super-soft feel on every touch. ENHANCED DURABILITY: Machine-sewn construction for durability that lasts for hours upon hours of play. EXTENDED AIR RETENTION: Butyl rubber bladder keeps the ball inflated for longer, reducing the need to re-inflate. RECREATIONAL PLAY: The soft feel and great durability make this the perfect ball for playing in the backyard, park, or beach.