The Tenga Flex has a fairly simple design with a black platic shell encasing the silicon. Inside is the ribbed silicon which I mentioned earlier is laking in the visual department. The design itself is pretty sleek and discreet so if that's what you're looking for then this is it.

Even though I have an issue with the visual aspect, the sensation was great. I wouldn't say it was amazing but it definitely was not bad at all. The ribbs inside the silicon provided really great sensation for me. One issue I did have was the tightness. It didn't feel as tight as I would have liked it to be but still decent nonetheless.