Features Cylinder-shaped ear plugs are the original ear plug design. They're also known as barrel ear plugs. Noise Reduction Rating / 31 dB Earplug Shape / Cylinder Insertion Method / Roll-Down Reusability / Disposable Cord Options / Uncorded Earplug Size / M Earplug Material / Foam Earplug Packaging / Bulk Bag, Unwrapped Earplug Pair Pack Type / Loose Series / E-A-R(TM) Classic(TM) Soft Standards / ANSI S3.19-1974 Pairs per Package / 200 Earplug Color / Yellow Metal Detectable / No