Efficient multi-axis aircraft specific positive and negative 12 inch propeller (one pair / 12 x 4.5)

This product is designed for four-axis, six-axis and other axis (multi-rotor) aircraft , special designed high-efficiency propellers.
 made of nylon material,  flexibility and maintain good stability. The special propeller has a powerful propeller compatibility! 
Compatible with virtually all of the installation currently on the market, 
it is equipped with adjustable ring, 4 different diameter can be adapted to the mounting shaft, 
it is 3.5mm, 4.0mm, 5.0mm and 6.0mm, easy to use! Not only easy to install, 
the propeller performance are also quite satisfactory, 
weight only 10g (1pc), can make the motor drive  more sensitive ,
 rotation small noise, super lift power, high efficiency , 
work with 500KV-1000KV motors will get great  performance.

package included:

Propeller x 1 
Anti-Propeller x 1
adjustable ring: one set --for 3.5mm, 4.0mm, 5.0mm and 6.0mm

specification:

Size: 12 x 4.5
Weight: 10g (1pc)
Center hole diameter: 6.0mm (can be adjusted by adjustable ring supplied)
Centre Block thickness: 9.7mm
work for axis distance: 550mm - 700mm
matched motor: 500KV-1000KV

propellers 8x4.5, 9x4.7, 10x4.5,quadcopter,mullticopter

propellers in 8x4.5,10x4.5