Triquetra Decals & Stickers All of our decals are made from high-quality, weather-resistant vinyl in the solid color of your choice. They are designed for use on cars, trucks, SUVs, motorcycles, minivans, RVs, boats, kayaks, snowmobiles, scooters, skateboards, home or office windows, helmets, and surfaces made of plastic or wood. They can be applied to any smooth, non-porous, and wax-free surface. Our decals are easy to apply, and detailed installation instructions are included with every order.