The Track of the Wolf liners are made by TJ Enterprises.
You can contact them directly and buy directly at a better price,,avoid the middle man thing.
They have a wider selection than TOTW shows in their catalog.
They even make air gun bbls for mfg's I understand.

Considered by many the top bbl liner on the market short of a custom made item.

Contact info I have for them is:

Mike Sayers at TJ's Liners

TJ's Enterprises
3652 Neltner Rd
Alexandria, KY 41001
859-635-5560