They are the sledghammer style round to square butt conversion. When they came they were a shiny white. A little sandpaper dulled them up a bit and gave them a bit of texture. They are actually too big for my hands so I think I will try to slim them down a bit.
Thanks! Glad to see they can be worked a bit with sandpaper; most S&W target style grips are a bit too thick for me.
