1. Material:    
1) Outer light-transmitting ring (optical grade PC/PMMA):         
High light transmittance, it can achieve uniform display of red, green and blue backlights without light leakage or shadow problems;         
Excellent scratch and yellowing resistance ensures stable surface gloss and light transmittance even after prolonged use    

2) Center adjustment knob (PC/ABS alloy):        
The surface can be finished with matte, high-gloss or metallic effects, while offering excellent wear and impact resistance;        
Good temperature resistance and can withstand high and low temperature changes inside the vehicle. It is not easy to deform or fade.    

3) Internal structural components (GF-PA/PP):        
High strength, excellent wear resistance; withstands repeated adjustment loads, no jamming or loosening over time.

2.Surface : Laser etching & soft-touch painting, anodizing, damping grease assembly