paper tubes
I buy shower rod covers. These are available at Lowes in the shower curtain/rod section. They are the plastic covers used to make your old rusty shower curtain rod look new again. They are light plastic and come in two or three colors, usually tan, black, or some other color. They are six feet in length and the diameter can be asjusted to whatever you like by twisting it, then CA in place. Cost 2.00.