This bowling set provides realistic action on any hard surface, indoors or out, for your recreational programs. Regulation-size poly pins can be weighted at the bottom with sand. They are easy to set up and wind-resistant during outside play. The hollow rubber ball is safe on all floors. The 2.5 lb. ball has a 2-finger span. Each set includes 10 pins, plastic setup sheet, scorepad and 2.5 lb. ball. Ball color may vary.