Printed with 2 shells at 8%, it's so thin it doesn't really matter though.Normally when you purchase this transmitter, you need a module and receiver to fly but I purchased this transmitter solely to use as a trainer so the module bay remains empty.  Instead of leaving it exposed, I decided to give it a cover. Here's a link to the exact transmitterhttp://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=52332