Looking at these - they look exactly like a smoktech bolt. A simple 3.7v tube mod. Normally they take a 18500 battery, but they are including the extension ring which allows you to use 18650 batteries.
If your looking simple 3.7v device - look no further. Great for someones first mod or to add to you collection.
These are normally $25-$30.00 each under the Smoktech name. For the price of a disposable - you can have a great starter mod.
Made of aluminum and have a anodized finish.
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BONUS: FREE WORLD WIDE SHIPPING
WARRANTY: 90 DAYS