Certification : NONEUsage : Fire Safety- Clearomizers with 510 threading- Color: Blue/Clear/Pink/Green/Red/Purple/Black/Yellow- Capability: 1.6ml- Resistance: 2.4ohm- heads cannot be replaced- no burning smell, no leaking- Compatible with batteries of eGo-T, eGo-C, eGo-W and 510 thread- Easy Refill-With the calibrations on the tank body, it's easy to control refilling and see how many leftHow to fill the cartomizer:Unscrew and remove the mouthpiece.Fill with 1.1ml to 1.6ml of e-liquid.DO NOT pour e-liquid into the center tube. That tube is for airflow.Insert the tim and screw it back on.Blow any liquid that may have gotten in the center tube into a paper towel by giving a quick blow on the mouthpiece.Give the cartomizer a quick shake or two and let the e-liquid feed into the wick for a minute or so.Screw onto your battery and start vaping.