It is a water based activity which is made of plastic. It is cylindrical in shape . Outer diameter is 9 ft and inner diameter is 5.5 ft. Length might vary from 9 ft , 11 ft and 13.5ft. It has net on either side for safety .
In lake or pond where depth is more than 5 ft , it is always advisable to go for 11 or 13.5ft long roller.