Whipline Black/Electric Yellow 3" DOT Decal Kit Registration Numbers Vinyl Lettering Semi Truck Tractor Trailer Decals All STIFFIE styles measures in at 3? in height and meet US DOT requirements when installed per instruction. All STIFFIE DOT kits include 4 each of the letters A-Z and the numbers 0-9 for a total of 146 decals. All STIFFIE DOT kits resist damage due to fuel spillage, chemical deterioration, fading, scratching and curling. All STIFFIE DOT Kits are finished with a UV Clear Coating to protect your decals from harmful Ultra Violet rays. STIFFIE uses 100% LEAD-FREE ink and marine grade vinyl. All STIFFIE decal products are environmentally safe and friendly. Application is easy; just peel away the decals from their backing and apply. All STIFFIE decals incorporate permanent waterproof adhesive.