Yes, they are tree tubes. I planted a dozens of Sawtooth Oaks, Gobbler Sawtooth Oaks, and Chinese Chestnuts. The tree tubes do help a lot, both in growth and protection from deer browsing. I ran out, so some trees got tubes and some didn't. Big difference! The tree tubes act as mini-greenhouses to extend the growing season, if you will.
The ONLY negative that I have found with them are the damn yellow jackets like to nest in them! If you don't do anything about it, raccoons smell the larva and knock the tree tubes down and chew the hell out of the tubes to get to it. I plan on getting some payback with the raccoons this trapping season!
I "think" I remember reading something that said it is not recommended to use tree tubes with apple tree seedlings. I'm not 100% sure about that though, but you might want to check into it before you plant.