Features bold, colorful graphics of Spiderman characters. Bop bag has a weighted base that can be filled with ½ gallon of water or approximately 5 pounds of sand for exciting bounce-back action. The single-direction inflation valve makes for quick inflation. For best results, fill base first and then inflate bag. Bop Bag is 36 inches tall, 10 inches diameter when fully inflated. Recommended for ages 4 and above.