... 2.Thickness:5mm, Dia.:35mm 3.surface design: Flat stainless steel tactile stud indicator1.install on sidewalks surfaces to assist the vision impaired ... such as footpath, passageway, walkway, ramp, stairs or landing3.materials: stainless steel or plastic4.stock color: yellow, gray, green, or as your ... location: airport, railway station, public walk way, mall, etc. stainless steel tactile stud indicator