Style: Corded NRR dB: 23 Size: Regular Certification(s): CSA Class AL Qty/Box (Pairs): 200 Push-to-fit style for hygienic and convenient wear Slow recovery foam inserts easily and seals the ear canal Reusable pillow pack keeps earplugs clean for re-use Corded for easy short term storage around the neck Surgical-grade, stainless steel ball bearings embedded in the grips provide metal-detectable quality control Test compatible with 3M TM E-A-Rfit TM Validation System