I was looking at Fender home page the other day reading thru the specifications of the basses. I was trying to figure out the differences among tham all. In the "frets" section, they frequently referred to "medium jumbo" frets. Jazzes sometimes said "custom jazz". Does that mean there could be "large jumbo" or "small jumbo" or "medium regular" or "medium small", etc? Are they referring to the height of the fret or the width of the space or what??