The all new Cryo Tube II geocaching containers are approximately 2" tall by .5" wide and include a teflon sealed lid. Cryo tubes were created to be airtight and able to handle extreme temperatures. These are most commonly used in the medical field but adapted to be used in geocaching due to their durability! These are prepainted black but you can easily paint them any color as needed for your application! Regular bison capsule logs fit in these perfectly!