... : 60si2MnA spring steel 3.Style: coil Detailed Product Description1) Air brake main spring for commercial brake spring and trucks2) Material ... steel wire, stainless steel wire, spring steel, brass, aluminum, copper, alloy, etcSurface treatmentpolishing, anodizing, zinc plating, nickel plating, ... us.PLEASE NOTE: Please allow 5-9 business days for your shipment to arrive. PaymentTT 30% deposit 70% ...