The coils are the heart of our atomizers. These gems come in a wide variety of styles – titanium, kanthal, stainless steel, and ceramic. Our atomizer coils come in two sizes, to be paired with either the Sai or the Sequoia. We have over 20 options for the Sai and the best-sellers were then made for the Sequoia. The Sequoia coils are larger; more surface area means more vapor.