Product Name: SpringMaterial: 304 stainless steelWire diameter: 0.3mm 0.4mm 0.5mm 0.6mm 0.7mm 0.8mm 1mm 1.2mm 1.5mm 2mmOuter diameter: 3mm 3.5mm 4mm 4.5mm 5mm 5.5mm 6mm 7mm 8mm 10mm 12mm 14mm 16mm 15mm 18mm 20mm 22mm 25mm 24mm 28mm 30mmLength: 305mm