... base and a heat-fired, opaque, glazed surface. haohai ceramic road stud:1) body material: porcelain2) face: opaque glazed finished3) size:4 ... ",6",8"4) easy install5) cheap priceperformance:1) wear resistant,ensure a decade without colour fade2) self-cleaning ... ) can be used alone or with standard lineSpecification ceramic road studs:Strong resistance, greater than 160KN Strong reflective,Used ...