water walking roller Size2.4m(OUTSIDE DIA)*1.7m(INSIDE DIA)*2- ... ball is inflatable, you need always to carry a blower with it. It has at least one air chamber, if there ... the second material floor, they can not have the feeling with the water. The water wheel r only has a single ... material, players will have the impressive feeling with the water, they will feel they are walking on water, it's more fun ...