... Security ForcesSpecification:1.Shell: Intensification Polycarbonate&ABS in base of first classic Polycarbonate,can be ... hardening surface,flat visor/convex, 4.5mm in thickness,resistant to impact,scratch,abrade,9 3 ... sweet action. 4.Visor frame: Removable visor frame,can be easy to fit in with helmet through Elastic ... visor will not down when it in the grade.5.Chin strap: Rubber strap,fire resistant ...