BIOHAZARD GASMASK vinyl Hard Hat Helmet decal - size: 4" ROUND - Hard Hat, Helmet, Windows, Walls, Bumpers, Laptop, Lockers, etc. Authentic Brand New Decal Manufactured by StickerDad. Hign Quality Oracal Vinyl. Outdoor or Indoor Use. Eco-Solvent Inks. 100% Made in the USA!