Adopts the high quality 100% 3K all carbon fiber board which imported from Japan improve material. Each pair of propellers has perfect dynamic poise and static balancing which balance by manpower. Especially improves the air-powered efficiency and aerofoil stability
 
 4 pcs washer ,
2 pcs 5mm,
2 pcs 6mm
Comes with 5mm and 6mm aluminium ring
very strong and light weight
package include x1pair 2pc  1cww 1cw