The Motorcycle Earplugs from Pinlock use a complex filter technology to pinpoint engine and wind noise but still allows other traffic or warning sounds to be heard clearly. The Pinlock Ear Plugs have a noise reduction rating of 16dB. They are also designed to fit well under your crash helmet with a discreet profile so that they shouldn't move when the helmet is put on or removed. Other features include: - Provided with both regular and large size. - Fully washable and reusable. - Silicone free, hypo-allergenic material. - Comes with unique case, featuring card and key holder.