Stud Pins Content: WC, Co Density (g/cm3):10.0-14.0 HAR:>1380 HV30 TRS (N/MM2):1660 Porosity (ISO): Free carbon and graphite phase: Metallurgical: A04B02C02E00 Grain size (um):1.2-2.0 Wear indicators: 71??.5 Pin color: black Studs Set Material: Low carbon steel, Aluminum, stainless steel, rubber, Iron surface processing:? Zinc plated? (no surface cracks, corrosion, and no separation of the zinc coating) Set color: yellow, golden, green, black, bronze .Get a grip during winter with our Ice Studs for shoes, boots and running shoes. Easy to install, the snow stud is perfect for walking, trekking, hiking or climbing during the cold season on packed snow, icy surfaces and much more.