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 ... always welcome, as per client's own design and artworks, material,size and thickness, special sign function requirements.For more or ... the reply within 24 hours. metal security warning signs