Those are the Pachmayr DIAMOND PRO SERIES GRIPS for S&W J Frame, Round Butt. Called so because of the "diamond plate" like texture. IMO they are cosmetically more appealing that the regular Pachmyr grips. It also appears that they have a nice cushion for the index/thumb webbing which gets hammered when firing a J-frame. I recently got a good deal on Crimson Trace LG-305 grips for my 642. They feel pretty good except on the really hot loads. The red laser is visible outdoors on sunny days for about 10 yards.
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