Glow in the dark sand Multi-Color 100g for FISH TANK AQUARIUM ornament Glow in the dark Fine sand(artificial) color as you selected each color 100g weight total. hours glow time after being exposed 15-20 minutes to sunlight, Usage:This are high quality glow in the dark sand with up to 8-61 If you want to paint something, please tell me. Delivery time: By Airmail: Generally, delivery to USA takes about 10-35 days. Delivery to Canada,AU, UK, and other European countries takes about 14-28 days.