The empire blades are characterised by an only constant profile and they can be corrected along the whole length. The radius on the upper surface limits the shaving and it allows an easy detachment. The radius on the upper sides assures a durable rake. This geometrical shape allows a lower function temperature; it results an extraordinary length of life and an excellent skin effect. The regrinding is made only on the anterior side, and that makes the operation extremily easy and quickly. The quality of sharpening remains constant during the time. The great number of cut corners obtained with evry blade mekes the empire system particularly economic.