Natural. It's pink and cute. Aquarium. Interior. Play. How about for hermit crabs or pet dishes?! I'm selling various sizes and types of shells! If you put in a slightly larger shell than the one they have now, they'll move in right away~ Let's put in various houses to see which shape they like! Some have holes and sand attached! Please understand that they may come out from inside! I'm also selling other items (^ ^) How about hermit crabs for summer vacation research? Let's find them a house they like! We've made a set with different sizes♪ Natural shells with holes and sand attached. #Breeding #AquariumCare Shells Hermit Crabs Okinawa Summer Vacation Summer Interior Summer Research Project Shells Sea Aquarium Small Animals House Breeding Natural Shells Sand Stones Holes