YOU WILL RECEIVE - (12) Green Stenuous of assorted sizes, plus a complimentary PDF copy of "A Practical Guide for Nautical Décor" eBook by Joseph Rains (delivered by email) HOUSES FOR YOUR HERMIT CRAB - Your pampered crab can choose between 12 beautiful turbo shells of assorted sizes. Shells measure between 5/8" - 1 1/2", with an opening size of approximately 0.375" - 1.25" NATURAL REAL SHELLS - Our Hermit crab shells are all natural and real. We never use painted or glazed shells as they are potentially toxic to hermit crabs FIRST USE TIPS - New shells should be boiled in water for 5 minutes then drained and allowed to cool GREAT FOR HOME DÉCOR - Use in a nautical decorated home, an accent for tables, in a tank for hermits, an aquarium for fish, or beach themed parties, the ideas are endless HOUSES FOR YOUR HERMIT CRAB - Your pampered crab can choose between 12 beautiful turbo shells. These shells of assorted sizes measure between 5/8" - 1 1/2", with an opening size of approximately 0.375" - 1.25"