These beads are unlike any other glow in the dark bead available in the market today. It's not a cheap flaky coating that makes these beads glow; they are made of quality Czech glass with a special glowing mineral from Austria added to the glass at the time of pressing. This material is non-toxic and is also used in medical tests such as CAT Scans. The glass takes on a natural dual-tone glow that brightens and intensifies even the most brilliant glass colors. No one will suspect that they glow until after the sun goes down.