The Futo V1 replacement standard coils are for dry content. With regular use all atomizer coils need to be occasionally replaced. To replace your coil just open the atomizer the same way you would reload it, unscrew the old coil and replace with a new one. The V1 case has a built in compartment to store your spare coil. To prolong coil life pack your bowls lightly and be careful not to scrub your coil when cleaning your atomizer.