Disposable ear plugs made from foam conforms to EN352-2:2002 Self-adjusting QED 301 ear plugs are designed to conform exclusively to the wearers own ear canals without too much user interference. Sold in a box of 200 pairs each ear plug has undergone tough testing to conform to EN352-2. Suitable for use in various working environments that require hearing protection rated at 39dB. Disposable pairs of foam ear plugs individually wrapped Conform to EN352-2:2002 SNR: 39dB Box of 200 pairs of foam ear plugs Supplied in a handy dispenser box