Please be aware that these glow-in-the-dark beads are made overseas, and while there are a limited number, some may have imperfections. I guarantee they will glow. As shown in the third photo, this is the glow after absorbing the light from a headlight, about the same brightness as a single cigarette. - Quantity: 150 beads - Diameter: Approximately 5mm - Hole Diameter: Approximately 1.9mm - Weight: Approximately 0.06g - Full Light Absorption Time: Approximately 30 minutes