Introducing the new HoneyStick C-Tank which stands for Compression Top - Ceramic Heater Tank. This 0.5Ml 510 Tread tank for prefilling makes those looking for a one-time use tank very easy. simply fill the tank and slide the compression mouthpiece firmly onto the center post of the tank and is sealed and ready to vape. This makes sure you get a great leak-free seal and removes the chore of tightening on a mouthpiece and having to worry about under or over-tightening it. For those looking to fill several cartridges at one time, this makes the job easy. Once you have these units filled is where the real pleasure starts with its low resistance ceramic heater and great airflow design where you will have flavorful notes and powerful puffs flowing in with each rip. The reservoir is a high-grade glass to ensure your concentrates are held safe. Just make sure to remember once you close the top, that's all it won't open again, so this tank is meant to be filled and enjoyed for that one fill and not refilled once out. The HoneyStick 510 thread C - Tank performs like a champ and looks great and works on auto draw batteries.