ALPEN FG Diamond Burs KS Shape . Alpen Diamond Instruments provide an extended cutting life and enhanced cutting efficiency due to their exceptional multilayer diamond coating. Multiple layered diamond instruments have uniform coverage layers of natural diamond. A new diamond grit layer with sharp edges will, therefore, be exposed for use during procedures as the outer layer wears. The high quality standard of Alpen Multilayer Diamond Instruments is ensured by a 100% optical quality control in addition to the dimensional quality control.