Nicely built, perfect shape and dimensions for my Fender ESD-10E.BUT - holy moly are they hard to sand down! Even with an electric sander it took forever, the saddle would get so hot it burned my finger tips! I literally sanded in several sessions and took breaks in between (yes, with the power sander!). I'd guesstimate it took a total of 15 minutes with 100 grit sandpaper. That's just NUTS!So there's something in the material (it smells like bone when sanded) that makes it super hard. Not sure it this affects its capacity to self-lubricate, but I have to presume it does. Will see!