Glow in The Dark -- They need to be put under the ultraviolet first or direct light after a while, they will glow in the dark. The stronger the ultroviolet, the brighter they will glow in the dark. Acrylic Beads - These luminous beads are made of quality acrylic, durable and lightweight, smooth to the touch, suitable for long time use. Easy To Use-- There are1.8mm holes at the top of the beads, use these star beads in between all your favorite beads or string a whole strand of them, these beads will add a little extra shine to your artworks. Quantity And Size - You will receive 112 star beads with 7 colors to choose from. Size of the beads: about 1.16''/2.95cm long, 1.2''/3.05cm wide, 0.2''/5mm thick. Wide Application-- Great for DIY your special and unique jewelry, widely used in attach beads, crystals, gemstones and some other pendants to necklaces, earrings or bracelets.