... torsion,double torsion and multi-torsion 2:MOQ:2000PCS wire forming torsion spring Please contact us to get lowest Offer.1.Material ... :carbon steel;spring steel;stainless steel,alloy steel.2.Wire Dia.:0.01mm-10mm3.ISO9001 certificate.4 ... ,powder coating.6.Applications: Automotive, medical device, electronics, toy,etc wire forming torsion spring