... coil Detailed Product Description1) Air brake main spring for commercial brake spring and trucks2) Material: 60Si2MnA, ... brass, aluminum, copper, alloy, etcSurface treatmentpolishing, anodizing, zinc plating, nickel plating, etcTypeCompression spring,Auto spring,others.Applicationauto, toy, electronics, ... allow 5-9 business days for your shipment to arrive. PaymentTT 30% deposit 70% after receiving the ...