Earmuffs X5P3E37279(AAD) Earmuff Style Hard Hat-Mounted Noise Reduction Rating 31 dB Dielectric No Cushion Material Foam PVC For Use With H-700 Series Hard Hats Industrial Safety Helmets Series X Standards ANSI/ASA S12.71-2018 Cup Material ABS Features Compact Design Dual-Ear Testing Earmuff and Earplug Testing Capability Fast Clear Accurate Results Science-Based Quantitative Testing Seamless Software Integration Tests 7 Frequencies on Both Ears Simultaneously Weight 12.45 oz