... ,steel,iron. Factory Advantages1.Near to raw materials region,low labor costs,so lower production cost,competitive price,2.Locate ... 3.Hardness(1):T4.Bonding agent:resin5.Reinforced net:one or two fiberglass netsBlack380080(1)Generally,please chose reasonable hardness ... wheel stronger,3.Two reinforced fiber glass nets makes our disc more strength,4.Sharpness,more powerful capacity,5.Extremely precise ...