All the material used is advanced. Photo Name Description Motor Wheel Trademark of material: A356.2 Hardness: HV80±5 Deflection: ≤0.5 Stator Iron core: Winding:100%oxygen-free copper, GB6109.7-90 standard Motor Shaft Material: 40Cr Hardness: HRC18-22 Hall Element American indigenous Halliwood company F41,F43(high-speed) Fireretardance≥150°,anti-static Leading wire Fireretardance, fluoroplastic F46≥180° Magnet 38H, magnetic flux≥285GS Fireretardance 120°- 140° Bearing Labyrinth,impermeable Precise order: 24