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