All Aluminium Special gradeblade set. The blades are made with special grade ,Aluminium and also these blades are adjusted to a unique angle for special air deleivery and high air thrust.High Grade lamination core for minimum electrical and high torque. Enjoy High RPM even at low voltage ( Excellemt performance even at 180V).Metallic corrosion resistant paint. Metallic Blue color that sparkles even in just a ray of sunlight . This is a protective coating which inhibits any rust for a long time Marked with a specialngold linestoadd to the perfection. Special blade Designer Decals to give a unique designer looks to the whole product .