3M E-A-R Classic earplugs were the first foam earplugs ever and are the most popular in the world. Today, they are still the leading seller across the world because of their outstanding advantages including: Excellent protection with an NRR 29dB; Easy to use cylindrical shape; Soft, low pressure for all day comfort; Non-allergenic, moisture resistant and non-flammable; Yellow for high visibility. E-A-R Classic earplugs are proven performers. Their proven size has been tested to be the right size to fit the widest range of ear canals while the cylinderical shape has been shown to protect better than tapered plugs. E-A-R is the only manufacturer to make its own foam, so it can regularly test for optimum and consistant performance. No wonder they've been the most requested hearing protector in the world for over 30 years.