Moss http://www.amazon.com/Zoo-Med-Terrar...exo+terra+moss
I like naturalistic tanks so I have rocks, plants, driftwood, vines, and moss in my cages. If you like the look of it you could certainly put it in there but they can shed by rubbing against themselves too. My BP always sheds in its hide rubbing on itself. I have other snakes that rub and pull the shed off on the tank items. Each snake can be different from the next and if its available they may use it but it is not necessary for the shed process.