The soft flexible flanges of the 3M™ E-A-R™ Tracer earplug adapt to the shape of the ear canal to form a triple-seal against noise, whilst also being metal detectable. In addition they incorporate an easy to see blue metal detectable vinyl cord, the only colour classified as non-food colour. This makes them ideal for the food manufacturing industry. Supplied in re-sealable pillow-pack for ease of use