These beautiful shells are made from natural shells that have been burnished and polished to become so shiny and beautiful. Natural mineral color, does not fade. We carefully select each piece of shell to ensure that there are no visible blemishes. So when used as decorations, they are beautiful tabletop marine-themed ornaments, and they are perfect for holding in your hand to see up close. If you want to use it for hermit crabs, you need a huge hermit crab to use, please refer to the size description of the picture and choose reasonably.