Earplug 3M EAR Tracer which is metal detectable. Does not contain ferrous filter. The soft and flexible edges shape after the ear canal to provide a triple seal against noise. Vinyl cord with blue color, which is the only color that is not classified as a food color. This makes the plugs perfect in the food industry. Easy to wash and clean. Delivered in a practical storage box. Carton: 4 boxes of 50 pair.