A convolute paper tube is a type of cylindrical paper product manufactured by rolling one or more layers of paper around a mandrel to a specific diameter and then bonding the layers together, typically with an adhesive. The paper used can vary in thickness and type, depending on the application requirements. These tubes are called "convolute" because of the way the paper is wound in one sheet. Spiral wound tubes are not made out of one sheet and therefore are much weaker.