The Innokin iSub Coils are specifically crafted for compatibility with the iSub vape tank series. With its groundbreaking 'no spill coil swap system', changing coils is a breeze. Equipped with a built-in 510 pin, swapping coils is as easy as unscrewing the tank's base and pulling out the old coil, making it exceptionally convenient, especially for newcomers to vaping.