The Fireluke 4 Tank has a 5ml capacity, a 510 base, and a replaceable 810 drip tip. It has a top filling system and is ISO 8317 certified as child resistant. All you have to do is lift and slide the top cap to fill the tank, which is extremely simple and convenient. In addition, the tank employs brand-new FM COILTECH5.0/Double-D Mesh technology, which features an innovative parallel mesh structure with two single mesh coils connected in parallel. It can improve the flavors and heating speed of the X1-D Mesh Coil by 50% It boosts your instant vaping process with even heating, stable structure, and maximum heating surface area, providing you with an unparalleled vaping experience.