Wokeface Rainbow Maker Sun Catcher Decal is made of a specialized light refracting vinyl. When sunlight shines through it, vivid rainbows appear! Instructions: Place on inside of window, enjoy rainbows! Most recommended for glass surfaces. Disclaimer: Decal removes without residue and can be repositioned carefully. However, the printed design ink can degrade/flake if you bend the vinyl when repositioning, especially if it has been on the window for a long time. This is not considered a defect and we do not replace decals that incur this issue. These come packaged with instructional topper card and plant-based compostable cello sleeve. Size: 3.75 inches