The first set of numbers (four digits) is the pattern number. This is followed by the width of the moulding (in inches) and the finish number. The finish starts with "M," "MDJ," or "SM." For example, 1192-4-M18 is pattern number 1192, which is a four-inch moulding, in finish M18. If you would like a different finish, simply order the frame as 1192-4-"desired finish."