[K9 ADVABCED MATERIALl] - The crystal drop prism uses K9 advanced material, K9 material has higher refractive index and stronger transparency | [HOW TO USE] - It has a small hole at the top, you can use a rope to pass through the hole and hang it up | [MULTI FUNCTION] - Nice for Home Office Garden Window, Feng Shui Crystals, Chandelier Crystal Parts, Wedding Decoration, Christmas Tree Decor or any crystal projects | [DISPLAT] - Put it under the light, it will reflect the bright rainbow | [WARRANTY] -If you're not satisfied with our product, please email us, we'll try our best to solve it for you