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3M Peltor Optime I, H510AC1, Ear Muffs Headband, Lightweight Ear defenders, Hearing Protection reduces noise level by up to 27dB, Pack of 1,Yellow : Amazon.co.uk: DIY & Tools
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3M Peltor H540P3E-475-GB Optime III Earmuffs, 34 dB, Hi-Viz, Helmet Mounted - Earshot Communications
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3M Peltor Optime™ III, Ear Defenders, Clip-on, No Communication Feature, Not Dielectric, Black Cups 7000107770 | Cromwell Tools
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