The Lost Vape UB Max Replacement coils are available in 3 different resistances to perfectly match your Sub Ohm vaping style. The X1 0.15ohm coil performs best between 80 and 120w and will produce a warm and cloudy vape. The X2 0.2ohm coil performs best between 60 and 80w and will produce a slightly less amount of vapor, but with better flavor. The 0.3ohm X3 coil will produce the least amount of vapor. The mesh construction of all three coils provides a larger surface area.