Two pairs of unused ER-20 Ear Plugs which have sat in a drawer since buying them. Comes with original carry pouch and black neck cord. £10 a pair or £17.50 for two pairs including postage to UK ETY•Plugs HD use a tuned resonator and acoustic resistor to replicate the natural response of the ear canal. This unique construction, combined with Etymotic’s proprietary sound path, reduces sound levels evenly across the frequency range without changing the sound quality. Result: The sounds of tools, machinery, vehicles and speech are clear, but softer and safer. Reduces sound levels evenly so that speech and environmental sounds are clear and natural, not muffled as with foam earplugs Reduces sound approximately 20 dB across the range of hearing Provides enough sound reduction in most settings to protect hearing, but keeps users aware of their surroundings Reduces the potential for hearing damage outside of work from loud machinery, vehicles, power tools, sporting events and recreational activities Provides better hearing in noisy environments because ears don't overload Reduces fatigue from long-term exposure to noise Not recommended for use with impulse noise, e.g., shooting sports