Ortho Arch Stainless Steel wire is manufactured of medical grade stainless steel materials, have smooth surfaces, accurate forms, and consistent forces to provide reduced friction and precise torque control. Proper wire characteristics are key in achieving treatment goals. All of Ortho Arch's Stainless Steel wires are diamond drawn to exacting tolerances guaranteed at +/- .0005". Stringent quality control and testing assure our wire will maintain PSI rating batch after batch. All arches are mid-line etched 3 marks for upper and 1 for lower.