metal security warning signs 1. widely used in pubilic security, 2 ... many ways like fire warning/alarm etc 3.OEM/ODM metal security warning signs 1.Material : Material include: PVC, acrylic, ... use for various areas. We make direction sign, warning sign, safety sign, male female sign, door sign, road sign, nameplate, ... right now! You can have the reply within 24 hours. metal security warning signs