Semi Decals & Stickers - Page 2 The decal is made of high quality weather-resistant vinyl, with an average outdoor life of 5-7 years. They are the same material used for semi-trucks and outdoor signs.These are die cut,vinyl decals. They are not inkjet printed with a white or clear background. What you see in black represents the vinyl in color of your choice. Easy to Apply! Easy Installation Instructions Included!