metal security warning signs 1. widely used in pubilic security, 2 ... fire warning/alarm etc 3.OEM/ODM metal security warning signs 1.Material : Material include: PVC, acrylic, stainless steel ... zinc alloy, copper, etc. 2.It is installed on the vehicles,buildings, or road sign in order to ... for various areas. We make direction sign, warning sign, safety sign, male female sign, door sign, road sign, ...