Here are the Puffin Billy Coils. These are made entirely of Kanthal A1 Wire so anyone who has an allergy to Nickel these coils will serve you well.
Puffin Billy 26
Core: 3 * 26g Kanthal KA1
Fuse: 36g KA1 Alien wrap
Resistance: Approx Single Coil 0.29 Ohms per coil
Double Coils 0.14 Ohm per set
Puffin Billy 28 (Series Coil)
These Puffin Billy 28 Coils were designed with series vaping in mind. They will perform extremely well In any series device as well as give you great performance if you just want a higher resistance in your atty. They are also suitable for people who have an allergy to nickel as Kanthal is nickel free.
Core: 3* 28g Ni80
Fuse: 36g Alien Wrap
Resistance: approx Single Coil : 0.5.8- 0.6 Ohm per coil
approx Double Coil: 0.3 Ohm Per set