This is Operation and Maintenance ( or Owner's) Manual is for 40 and 50 HP Mercury 2-cycle outboard motors from 1999. It may be used for additional years near that year of manufacture as there are probably few significant differences in them. It covers; Features and Controls, Operation, Maintenance, Storage and Trouble Shooting. The manual is 94 pages long and in very good condition. If your manual is missing, you should have this to guide or remind you how to properly use and maintain your outboard motor. Shipped by USPS Media Mail for $4.50 within the USA if you cannot pick it up.