our 510 is with very big vapor which only sell about 12.5$ and the passthrough is only 3$, the charger line of the passthrough can change short or long when you use it, it is very convenient, we still have many new products, do you interested? Our company H&Q international group( ***** ) , is the OEM e-cigarette in china. We have 3 years experience in e-cigarette manufacturer. Our disposable e-cigarette only sells 2.38$, and if the quantity is bigger, it will be more cheaper. We have all different kinds that sell hot in the market, such as the HQ EGO, HQ EGO-TANK, HQ PCC, HQ drip tips , 808D-1, 510 and 4081 and so on. Our drip tips can have all different kinds ONLY 0.38$ and we also have many other new products that Many of our VIP clients such as Vapor4life like our diamond battery. You can see the pictures and vedio of our products, and you will know it is good products with big vapor.