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Propellers are described in numbers. The first number is the propellers diameter and the second number is the blade pitch.
If you draw a circle around propeller blades, this will give you a diameter in inches.
Pitch is the theoretical distance that a propeller moves your boat forward in one rotation. Again this number is in inches.
This means that a 14 x 19 propeller has a diameter of 14 inches with a pitch of 19 inches. In conversation, most people would describe this simply as a 19.
Too few RPM at full throttle might mean you need less pitch. Too many RPM at full throttle, you may benefit from a propeller with more pitch.