Ribbed grip and softer silicone and the USB hole big enough for your charging cable.
Silicone cases are simply designed Fits smok alien kit 220W.
All the corresponding button positions are marked correctly so one can adjust iStick easily without taking it out of the case.
1 x Case Cover for Smok Alien Kit 220W
Package includes
Stretchable silicon material that fits snug on your mod.
It is more comfortable and more economical.
The rubber helps gives extra grip when holding your mod, especially in wet conditions. 
