Material of Slow Moving Vehicle Sign: Made of 1.0 mm thick rust-free aluminum sheet that can withstand extreme weather and harsh conditions.These vehicle reflectors will not bend, warp or break, Meet Traffic Regulation: Red retro-reflective border and red-orange fluorescent center can be seen up to a distance of 600 ft, as per the ASAE-276.4 standard. The colors are quite bright and very reflective, Material of Mounting Bracket Kit: Consists of electro-galvanized steel brackets, bolts and nuts, will not rust or breakdown, Easy to Install: Each Slow Moving Vehicle Triangle has 2 pre-drilled holes that fit the mounting bracket perfectly for you to fasten the caution sign easily and quickly, Widely Used: Slow Moving Vehicle Sign is often used for farm vehicles, golf carts, UTVs and road construction and maintenance vehicles