Peltor - 3M Optime III Ear Muffs 33DB - H540A Ambidexterous It is bio-based

It is bio-based

and 1-1/4"-12 without bushing

*     Headspace to your fired cases

Fits: Any set of calipers

Also great for:

Peltor - 3M Optime III Ear Muffs 33DB - H540A Ambidexterous It is bio-basedThe 3M PELTOR Optime III, H540A earmuff is a high performance hearing protector and has been developed for use in high noise environments like airports, marine engine rooms, power stations, and print works. The double casing technology minimises resonance in the holder casing resulting in maximum high frequency attenuation. The large space inside the cups helps reduce heat and moisture build up, and the soft, wide foam cushions offer low contact