The SMOKtech Micro TFV4 Replacement Coil features the Micro CLP2, a dual fused Clapton core packed into a smaller shell, built specifically for output wattages in the 30 to 60W range without sacrificing vapor production and the Micro STC2 Core features a Stainless Steel dual core that is designed to utilize the temperature control capabilities of the R80. Each coil is built with organic cotton and a vertical coil arrangement