necessary to pierce the shells. You need a little 'or flexshaft Dremel and drill that fits up to 16 gauge. If you are not sure how big it is, you are looking for small holes in the shells, is a giant of them. During the drilling shells, you can add jumprings each, and then no matter what their second string jewelry, or you can just run through the second skin fragments, and the nodes on both sides of each piece as you go to keep their place. And, last but not least, if you know anything hemp knotting (books will be available around the local craft shops), you can do a really nice necklaces with shells and found objects on the beach of hemp.