This can be a little bit confusing, since most people think just in terms of fret height. But when you evaluate fret sizes you have to think both in terms of height and width.

The most typical reference for terms such as "jumbo" and "medium-jumbo" come from Dunlop fret-wire references. The most typical are (Width x Height):

6230
This is the smallest wire available. Typically, found in older Fender necks.
Size: .080" x .043"

6105
Modern, narrow and tall, a popular choice.
Size: .096" x .047"

6130
Often refered to as Medium Jumbo. Standard sizing on most Gibson necks.
Size: 106" x .036"

6150
Vintage jumbo.
Same width but a bit taller than Medium-Jumbo. Size: .103" x .046"

6100
This is Jumbo, the biggest guitar wire available. Gives an almost scalloped feel to the neck.
Size: .112" x .055

Relative Fret Sizes



These references are not exact and may not represent what manufacturers are actually calling "medium-jumbo" and "jumbo". Also there are variances in fretwire manufacturing process which would create differences from the above.


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