Hover Bowling includes ten weighted plastic bowling pins and two air-propelled, battery-operated black bowling rocks ready to be played indoors on the 78½”L flexible polyester play mat. This completely unique game comes with detailed directions for play, and may be stored and transported in its portable, reusable box with handle. Vacuum the mat or sweep clean with a dry brush before storing. With the exception of installing batteries, no assembly is required. Each bowling rock (7½”diam.) requires four AA batteries, not included.