Etymotic ER20-SMF-C High Fidelity Reusable Earplugs [Clamshell Box] Ultra-Comfortable Hearing Protection for Concerts, Festivals, Sports Events, -20dB even volume reduction, Frost Tip Standard SIze: Amazon.co.uk: Health & Personal Care
Of late, I've been using these. I used to use ACS ones but they seem to have branched into making customs instead.
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