Short enough to get into tight spaces. It is used to remove air bubbles and aid penetration of resins into. Excellent lay-up properties and exceptional durability.  All roller surfaces are fitted with Protec high-performance bubble rollers, which provide great life and efficient air relief. This roller will suit all types of fiberglass applications and is suited to be used in a wide range of damping materials, including wool and polyester. Superior Roll Out Time| High performance bubble rollers| For efficient air relief and excellent lay up properties| For fiberglass and damper material lamination