1.center of tyre studs:
Chemical composition: WC-80%+Co-10% (YT10)
Density: (g/cm3):13.0-13.5
Hardbess HRA :>90(>1300HV30)
TRS Mpa:(N/MM2):1660
Poposity :(ISO):Free carbon and and Graphite phase :N phase :E00
grain size : (um):1.2-1.8
index of abrasive resistance :71+/-7.5
the center color: black                                                                                                             

2.cloth of tyre studs
Material: low carbon steel
Surface: Zinc coated