The Solo 2 Replacement Coils (a.k.a the Vaptio Grand Coils) are compatible with various Vaptio devices on the market. Each 0.25ohm coil is rated between 20-50W and perfectly suited to the adjustable wattage of the Vaptio Solo 2 Kit. The Kanthal coils combine high quality wire and organic cotton, and as a result produces a dense and large cloud of vapour with a minimal wattage requirement. Likewise, a clean flavour is also produced by the high quality coil. Bringing out flavour notes that are subdued by other, lower quality devices. In effect the Solo 2 Kit paired with the Vaptio Grand Coils offer a performance that is hard to match in this price range.