Annulus gap shielding snakes are designed to sit or be wedged into the gap created between the canister and transfer cask. T-Flex® snakes are wedged shaped to ensure the fit snuggly into the gap without falling all the way down. Due to the properties of T-Flex®, a plant can expect dose reduction not just with gamma radiation, but also with neutron radiation. These snakes are also covered in fire blanket material to handle the high temperatures associated with dry cask operations.