The blades are from spring 2013 made of a new stronger and stiffer material colored grey. That´s why the bladekit has changed p/n to 6513. The new blades are compatible with older propellers, but should not be mixed with the older black one's other than in emergency cases.
Package contains: four singel blades model nr. 6501 Diameter: 11,5" Pitch range: 11-17"