All our plastic pieces are attached with screws that are tapped into the frame of the equipment, we do not use adhesive or glue like many other brands do to attach their plastic. Like the brake pads on your car after so many "miles" the plastic protection will wear down or fall off after continued use as they are put on high wear points. In an effort to provide a better customer experience we have made these parts available for purchase online so you do not have to talk to a sales rep to order new plastic.