Dan does both "stippling" and "shark skin", stippling is much like the "golf ball" texture you see from other gun manufacturers, the shark skin is whats shown in the above pictures.
Mr Bowie does a texture similar to "shark skin" but the lines run vertically, rather then Dan Burwell's horizontal lines. Mr Bowie's grip texturing also encompasses the entire grip surface, rather then just the front and back strap.
The small differences, between stippling/shark skin/horizontal/vertical lines are almost all purely cosmetic, so its up to your eye's preference. Suffice to say, none of these custom jobs will be prone from leaping from your hand!
Talk with either gunsmith and they could probably accommodate any kind of pattern or combination that you'd like. Poke around their web pages as well, many examples of their grip enhancements on their sites.
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