Skullgard 454617 Tan Class G Type I Hard Cap With Staz-On Suspension MSA Natural Tan Skullgard Class G Type I Hard Cap With Staz-On Suspension MSA (Mine Safety Appliances Co) MSA (Mine Safety Appliances Co) - 454617 Meets or exceeds the applicable requirements for a Type I helmet (top impact) as outlined in ANSI Z89.1-2003, Class G (electrical, low voltage). Meets or exceeds the applicable requirements for a Type I helmet (top impact)