1.510 threaded compatible with all eGo series batteries
2. Fit for T3S coil changeable clearomizer.
3.Double fiber rope can produce big vapor
These heads are not compatible with older model T3 eGo Bottom Coil Head Replacements and without a T3S eGo Bottom Base. However you can use older T3 tubes with a T3S eGo Bottom Base and a T3S eGo Bottom Coil Head Replacement.