H4979 Twin Cup Design Hearing Protector Optime III   See larger image and other views  Your Price:** $22.95 Customers who purchased this item also purchased: G7314 Heavy-Duty Mobile Base $69.95 G2974 4" Wire Hose Clamp $1.09 Description Attenuation Ratings: H540A-411-GQ ; H540B-412-GQ ; H540P3*-413-GQ Optime III is a super-muff, and has been developed for use in extremely noisy environments. The hearing protection is based on a technology with a double casing that minimises resonance in the holder casing. This results in maximum high-frequency muffling, while at the same time its still easy to understand speech and signals. An acoustic connection between the inner volume and the volume between the casings in its turn provides maximum low-frequency muffling. The sealing rings are broad and filled with soft plastic foam for the best fit and low contact pressure. Effective ear protection and best comfort are the hallmarks of Optime III. See page 451 of our 2009 Grizzly Catalog! See similar items in: > Home > Safety Equipment > Ear Protectors Final prices will include state sales tax for items shipped to WA, MO, or PA. Shipping charges for items not shipped via truck freight will be added according to our shipping rates.