Universal 30mm attachment posts  , Maintains optimum and even cushion pressure  , Twin stirrup design maintains stability and attenuation performance  , Airing and park positions  , Low profile - reduces snagging risk  , Lightweight design  , Simple head size adjustment  , Impact resistant ABS ear cups  , Suitable for working with electricity (Dielectric)  , CE certified to EN352-3-2002  , SNR Rating 27 , Approved to global hearing protection standards (CE, ANSI, AUS/NZ)  , Universal maintenance and hygiene kits