N4f is screws free, electric, nickel free, plating free and welding free with 6mm recyclable polymer. The weight is 40% lighter than acetate. The Anti Iron color is painting and polishing into Raw iron effectives by hand one by one.
43mm lens size
24mm bridge
145mm temples length
UV400
remark:
ultrasonic cleaner machine and ethanal may affect painting on the spectacle.