You are buying a New Old Stock hydraulic disc brake repair kit (p/n 73072, NSN 2590-01-180-3594)for a DP recovery winch, used on some of their models rated between 20K-100K lbs.  There may be some oxidation from long term storage. Sold "as is".  There are 10 friction discs (p/n 3158 /11603), 9 steel discs (p/n 3159) and 1-2 gaskets (p/n 11349).