These are replacement coils for the Smok TFV8 subohm tank. They use a vertical coil design with organic cotton wicking. There are 3 varieties of coil and an RBA base with an easy-to-build velocity-style deck.
V8-T8: 0.15Ω Octuple Coil (120W - 180W)
V8-T10: 0.12Ω Deca/Decuple Coil (130W - 190W)
V8-Q4: 0.15Ω Quad Coil (90W - 150W)