Just like the other Zolos its made of super soft stretchy real feel material incased in a hard shell but this model has an added extra. You can twist the case to create a different senstation or just to lenghten it by 2 extra inches. Its standard size is 7 inches but with the twist option it will cater upto 9 inches. The chamber has lots of bumps and ridges for exciting stimulation. Simple to use and clean and can be taken with you anywhere thanks to the non descript casing.