CNC Machine Prodction Competitive price Excellent quality Good in-sale and afte-sale service OEM&ODM are acceptable Different Kinds of Upholstery Springs Features: Wire diameter0.2mm to 8mmMaterialStainless steel, carbon steel, spring steel, alloy spring steel, refractory steel, brass, bronze, etc.Surface treatmentZinc-plated, nickel-plated, chrome-plated, silver-plated, gold-plated, imitation ...