The product is a set of four machine knitting books by Mary Weaver, focused on the Passap Duomatic and Fairisle techniques for Brother knitting machines. The books are in paperback format and written in English, with the author being Mary Weaver. The publisher is Weaver, and the books cover topics related to knitting, specifically for machine knitting enthusiasts. The country of origin is the United Kingdom. This set of books would be a valuable resource for those interested in learning and practicing machine knitting with specific focus on the Passap Duomatic and Fairisle methods.