Sabre blade S 2000 maragin.
BF - Blaise Freres , the French factory. A world leader in the production of blades of steel Margen. These blades are used by almost all the world's leading athletes. The factory itself does not sell blades, so you can often see two brands, for example, BF and All star, Bf + Uhlmann, but all these blades are made at the factory in Lyon.
For brand 4, both standard blades and blades with individual characteristics for the bending boom and the stiffness zones on the blade are produced directly at this factory.