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4. Light high visibility disposable foam earplugs. https://www.amazon.com/Howard-Leight-Visibility-Disposable-LL-1/dp/B0007XJOLG/ref=zg_bs_3779871_4/161-1751891-2750636?_encoding=UTF8&psc=1&refRID=5KJMABG7XVEP0W78R1RV (accessed 23 Nov 2016).