This type of glue labeler applies pre-cut labels to products. As products travel down the line, the labeler dispenses the labels onto both sides of the product. The machine usually unwinds the labels from a roll, dispensing the labels on the product (usually bottles), and winding up the leftover backing. A flap, brush, or roller then slides across the labels, ensuring that they are firmly attached. Products such as beer and ketchup bottles use this application.