Features:
Each pair of propellers has perfect dynamic poise and static balancing which balance by manpower. 
Especially improves the air-powered efficiency and aerofoil stability.
Very strong and light weight.
For DJI E600 Quadcopter.

Specifications:
Material: Carbon Fiber
Length: 12 inch
Pitch: 4.2
Weight: 33.73g/pair
Package size: 40 * 15 * 3cm / 16 * 6 * 1.2 in
Package weight: 84 g / 3 oz

Package list:
2 * Carbon Fiber 1242 12*4.2 Self-locking Propeller CW
2 * Carbon Fiber 1242 12*4.2 Self-locking Propeller CCW