5 Pack of replaceable genuine Joyetech branded Atomizer Heads to be used with eRoll electronic cigarette.  

Standard Resistance is rated at approximately 2.5 ohms and provides a great balance between performance and lifespan. 

Low Resistance is rated at approximately 1.7 ohms and burns hotter than standard resistance therefore producing more flavor and vapor.  However, low resistance atomizer heads use more power which causes the battery to drain faster and since they burn hotter their lifespan is shorter than normal.