Help your hermit crab upgrade his home with the Zoo Med Hermit Crab Growth Shells. These natural shells are a great way to accommodate hermit crab’s changing size. Helps accommodate hermit crabs as they continue to grow Crafted to allow the crab to fully retract inside Available in various sizes Utilized to promote healthy and proper growth Available in the following sizes: Small (3 pack) Medium (2 pack) Large (1 pack) X-Large (1 pack) *Shells come in a variety of styles and colours*