This action packed 2 vs 2 player game - teams have 3 hits to return or spike the ball onto the net. Bring to the beach, field, backyard, park, campsite or even tailgating! The rules are similar to volleyball where each team has 3 hits to spike the ball into the ankle high circular net. Teams volley back and forth until a team is unable to return the ball to the net. The first team at 21 points win. Slam Ball Set Includes: 3 balls (two 9cm competition size and one 12cm training ball), a durable net, ball pump and a carry case for all the materials.