This bowling set provides realistic action on any hard surface, indoors or out. Regulation size poly pins. Hollow rubber ball is safe on all floors. The 5-lb. ball has a 3-finger span to accommodate different-sized hands. Includes 10 regulation size (15"H) weighted plastic pins, cardboard pin set-up sheet, score pad of 100 score sheets. Pins weigh approx. 11 oz. The plastic part of each pin weighs approx. 4 oz. and is filled with 7 oz. of sand to provide additional stability. The pins have a removable top plug that allows users to add additional sand if desired. Ball color may vary.