Description Scientific UV beads are extremely sensitive to natural light and change color dramatically from white to various colors when exposed to sunlight or even on an overcast day. They need to be put under the ultraviolet first until they turn into different colors; Then they will glow in the dark. The stronger the ultroviolet, the brighter they will glow in the dark. If they don't put under the ultraviolet first, they will not glow in the dark. Features - Color: 7 Colors. - Material: Plastic. - Size: 8mm in diameter, 6mm in high, 3.5mm hole in the middle. - Amazing Beads Color Magically Changing UV Reactive Beads for Jewelry Making. - Package comes with 6x8mm 1000pcs pony clear beads color changing in the sun. - Appear translucent at first but bring them out into the light and watch them magically change from clear to colorful. - plastic pony beads color changing in the sun for DIY bracelet or necklace, amazing gift. - Fun for jewelry making, and great for teaching UV awareness!Package list: 1000 x Multi 7 Color Plastic UV Beads Clear Beads Color Magically Changing UV Reactive Pony Beads Light in the Dark for Jewelry Making