Adopted with conch, strong air permeability, provide a environment feel. This is very safe for your fish. Our Fish Tank Decor is great to use beautiful decorative shells to decorate your aquarium at any time. If you are looking for a fish tank decoration, then you miss our adornment. It can also be a house for crab. Features -Color:Assorted Color -Material:Shells -Size:5.00X5.00X4.00cm/1.97X1.97X1.57in -Note:It comes with different sizes. -Using material, our Crab Shells are durable and safe, not polluting your water in fish tank. -Fine appearance and details of the shell make it look beautiful and attractive and unique. -An awesome festival gift for those friends, family or yourself who like raising fish, and they will be happy. -These can be used as a tabletop or office decoration for most occasion and events. -Can beautify your fish tank, make your fish tank look more interesting, and turn it into a feature. Package list: 54 x shells