The Shroom, just like a mushroom has a flared head and a slimmer shaft. Also known as the Headmaster Senior this one measures 8.12 inches high of which 7.12 is insertable. The head is a whopping 4.12inches wide 13 inch diameter, and the shaft is 2.34 inches wide, which is about 8.12 inches around. The toy is made with firm PVC and whilst it is fairly firm but flexible. A big favourite already with customers that like the bigger, wider toys.