Decorate your hermit crabs habitat with the colorful, unique All Living Things Decorative Shells. Helps protect your hermit crab as it grows. Each shell is approximately 2" x 1.5". Exclusively at PetSmart. Features: 3 unique decorations Includes: 1 - Pack of Decorative Shells Caution: This is not a toy. Keep out of reach of children. Advice: As hermit crabs grow, they require larger shells. Provide at least two additional larger shells of varying sizes. Your crab will select the shell that best fits its needs. Do not be alarmed if your hermit crab changes its shell as often as every two days.