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 8512 (8511 obsolete being replaced by 8512 ). 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. 8501 Diameter: 13,0" Pitch range: 15-21"