The roller is made of natural leather 2.5–2.7 mm thick, reinforced with a 1 mm thick plastic layer.The roller comes with two mounting straps.The mounting rivets are made of steel and may rust when exposed to the elements. As a manufacturer, we take all our defects into account The formation of so-called “bubbles” filled with air, which are caused by weather conditions, does not constitute grounds for complaints about leather products! Leather is a durable, flexible material that adapts to conditions (shrinks and stretches), which increases the risk of “bubbles” forming.