The truth is that this bouncy alien head is a whole lot of fun its irregular egg shape means that when you bounce it it could go off in any direction and its vibrant green material glows in the dark too out of this world fun bounce chase and play with glow with the glow in the dark bouncy alien headr r glow in the dark bouncy alien headrubber egg shaped bouncy ballsize 5cm x 35cm diameterbounces in irregular patterns