stainless steel 316 stainless steel contains an addition of molybdenum that makes it corrosion resistant. It is specially made to withstand constant exposure to salt and water (so fits rainy/snowy environments). It is also heat-resistant so it can be great for factory environments. Stainless steel is the ideal metal type for all plaques, both for interior or exterior use thanks to its durability and endurance. The plaque will not be polished with gloss to prevent whatever if the sign is outdoors. for certain orders, it is possible to ask for no paint at all. It can last up to 60+ years depending on the different factors. Brass  Brass is an attractive bright-gold color, that is way cheaper than actual gold. It is long-lasting and perfect for all indoor plaques, and can also fit certain outdoor environments (but not as nearly as durable as our stainless steel plaques). Brass will break down if residing near marine or otherwise salty environments. Salt, in particular, tarnishes brass quickly and must be kept away from brass intended to be kept shiny. All types of brass plaques that we offer have the same properties and benefits, the choice between them is purely aesthetic.