This post will be of interest:
As one of the most respected and long standing manufacturers I wrote to Progress Vulfix for this information. My knots are not supplied by them.
This is the tale of one enthusiasts journey back to the world of traditional wet shaving. It's not intended to instruct - you probably know more than I do about many of the products or issues I describe. My blogs are really a series of personal diaries about my retirement hobbies that I'm happy to share with anyone whose interested. Welcome - and thanks for looking in.