Answer:
The Honeywell Bilsom 303 features an SNR attenuation rating of 33 dB and an SLC80 rating of 22 dB (Class 4) for uncorded configurations. It is designed in a tapered bullet shape made from polyurethane foam.
The Honeywell Bilsom 303 single-use earplug delivers certified hearing attenuation rated at a Single Number Rating (SNR) of 33 dB under European EN 352-2:2002 testing standards. Under Australian/New Zealand AS/NZS 1270:2002 test standards, the uncorded version provides a Sound Level Conversion (SLC80) of 22 dB, classified as Class 4 protection (with bulk refill dispenser formats rated up to SLC80 24 dB, Class 4).
Geometrically, the plug features an ergonomic tapered bullet profile made from soft, low-pressure polyurethane foam. This profile allows the plug to be compressed cleanly during roll-down and expand evenly within the ear canal over an expansion dwell time of 30 to 40 seconds to establish an acoustic seal.
