Pros and cons of different substrates?

[kiiarah]

Perfect, the sheds are one of my main concerns. He had some issues with his last shed. It didn't come off in small pieces, which is good, but he got about 2/3 off and the last part was left on. I think it is possible that he caught the skin on something and tore it that way, but he has a bit of scale damage now where the skin stuck. I would really like to avoid this next time around and I am hoping sufficient consistent humidity is all it will take. Just curious, what do you give your snake to help it shed, as in what types of objects are in the tank for it to push against. I was reading that the bark substrate can help them shed because it is rough, but I am concerned about that because it seems that rough (potentially sharp) bark could be at best uncomfortable and at worst damaging to their belly. If you just use paper towel then your snake must not be using the substrate to rub on (or do they?) is just a branch in the tank sufficient?