SKYSMOKE PROTANK MOD glassomizer is another innovation from the MOD/EGO/510 atomizer collection. The PROTANK MOD glass-type atomizer holds 2.5ml e-liquid and its coil is a changeable CS system dual coil unit!SKYSMOKE PROTANK MOD usage: first turn the glassomizer clockwise onto the MOD/EGO/510 series battery and then screw off the glassomizer cap/hull. Make sure the coil unit is fixed in position or turn and fixate it in the lower part of the product. Fill the glassomizer with e-liquid and put the cap/hull back in its initial position. Wait for 5 minutes and your glassomizer is ready for use!