plastic tactile stud indicator 1.material: Plastic 2.Thickness:5mm, Dia.:35mm 3.skidproof diamond design plastic tactile stud indicator1.install on sidewalks surfaces to assist the vision impaired people, the elder and children walk safely2.Being required to be installed to an approaching hazard or change of direction along a path of travel, such as footpath, passageway, walkway, ramp, stairs or ...