These UV beads are sensitive to sunlight and can change color dramatically to various colors when exposed ultraviolet irradiation even on an overcast day. The stronger the ultraviolet, the darker the color. Made of plastic materials, compact, easy to use, good for DIY jewelry making and bring you better using feeling.Features-Color:Random color._x005F_x000D_-Material:Plastic._x005F_x000D_-Size:0.80X0.80X0.80cm/0.31X0.31X0.31in._x005F_x000D_-Colorafter ultraviolet irradiation: Rose, orange, yellow, fuchsia, blue, indigo, violet._x005F_x000D_- Unique design: Exposure to sunlight will change color, even in cloudy and rainy days, the more UV rays, the darker the color will be._x005F_x000D_- Wide applications: Our color changing beads are very suitable for making necklaces, bracelets and more jewelries._x005F_x000D_- Premium materials: Made of plastic materials, these beads are safe to skin and durable for long service life._x005F_x000D_- Easy to use: The rope is easy to pass through, for you to DIY different handicrafts, and send to your family or friends._x005F_x000D_- Educational meaning: UV sensitive beads are also suitable for a variety of teaching UV awareness, party play activities to bring kids more fun.Packing list1000 x UV beads