The 3M EARsoft Metal Detectable earplugs are made from slow expanding polyurethane foam material, that gives evenly distributed pressure allowing flexibility and a good seal with optimum comfort. With the advantages of the EARsoft with the added benefits of a blue detectable cord and an integral stainless steel ball in the non-food blue earplug. Ideal for use in food manufacturing industries. SNR 36dB H34dB, M34dB, L31dB.