XiaXia Pets Hermit Crab Shell Green, Yellow Purple Design Just like real hermit crabs, Xia-Xia (pronounced Sha-Sha); love to change shells, and now kids can dress them in tons of fabulous fashions. Xia-Xia shells come in a variety of patterns, styles, and colors. Each shell has two magical surprises inside to add to your Xia-Xia collection!