A Set of 4 High RPM props - 10 x 4.5" - these props are a matching set of 2 x CW(R) and 2 x CCW(standard) low pitched multicopter props -slow flyer NYLON - CARBON stiff composite injected - for high RPM - 10,500. Buyer must be aware All props require balancing for aerial video work. 2 bladed props develop better overall efficiency than a 3 bladed prop - but they are more difficult to balance for perfect video ops (lateral balance Chord wise balance) - rigid stiff 2 bladed props also produce vibrations at high forward speeds as they are not able to flap-to-equality when moving from the advancing side to the retreating side of the arc - this shows on video compared to the 9050 triples. For flat hovering and slow manoeuvring - they cannot be beaten for lift and thrust on low disc loading machines. These slow style spoon props develop must of their thrust in the outboard section.