DetailsThe crystal shards sparkle bright and sharp, giving rainbow spectrum flashes of light against their pretty background colours. They are a high quality, durable product used to create exciting visual effects on dance and exercise hoops, flow toys, scrap books and for general crafts. They have a peel-off backing. These tapes use a solventless, non-toxic, non-polluting adhesive, and they comply with the European Union RoHS directive. 2.5 mils thick.