These lovely sea urchin shells come in natural colors include dark pink, light pink. Great for Beach Cottage inspired Home Decor and Crafts of all kinds. Other than that, the shells are perfect for mermaid costumes, beach weddings, wedding card holders, nautical party favors, and of course the widely popular terrarium hanging jellyfish. The size varies, range from 2"-3". It's a great craft supply for air plant display. The scientific name of this shell is Hemmicentrosus Pulchenismus.