Replacement wide-view clear grinding visor frame for the 3M℠Speedglas℠9100 FX/ 9100 FX-Air welding helmet. Classic℠Plus earplugs are slightly longer than regular E-A-R℠Classic℠earplugs to fit deeper into the earcanal and provide higher noise reduction.Low pressure foam conforms to the shape of the ear canal for enhanced comfort and wearabilitySlow recovery, low pressure foam conforms to the shape of the ear canal for enhanced comfort and wearabilityNoise Reduction Rating (NRR) 33 dB. CSA Class ALFlame resistant—important for potential arc flash situations and for storage considerations