HOBANG crab shells are available in 11 different sizes and shapes to give your hermit crab a variety of options. Pick the most comfortable new home for him. Meanwhile, shells come from natural sea shells, without any paint, completely polished by hand. Never worry about the health of the crab shell house. Please Note: 1. The new shell should be sterilized in boiling water for 3 minutes, then cooled and then placed in a crab. 2. Do not use painted or glazed shells for pets as they are dangerous and potentially toxic to hermits. 3.Please undertand all seashells are 100% natura, and inevitably have color, size, shape difference and some minor defects.