GeekVape B Series Coils are compatible with the Aegis Boost, Aegis Boost Plus, Aegis Boost LE, Aegis Hero, Z Nano Tank, and Z50 Kit. Types include: B0.3 Coil - 0.3Ω (30 - 38W), B0.4 Coil - 0.4Ω (25 - 35W), B0.6 Coil - 0.6Ω (15 - 25W), B1.2 Coil: 1.2Ω (10 - 14W).