The Hearthsong Inflatable Buddy Bumper Balls comes with a set of 2 blue translucent bumper balls. The Bumper Balls can inflate to 36” diam. (pump not included) and are made of strong PVC plastic, ensuring hours of bumping, rolling, and jumping fun. Invite every-buddy in the neighborhood to your sumo wrestling match or bop all together at a homemade music concert. Adult assembly and supervision required. Set includes two balls in one box.