We can produce all kinds of spring for embroidery machine,can offer you samples free after you ... ,China' leading compression, extension and torsion spring manufacturers and spring for embroidery spring suppliers.1). Material: stainless steel, steel, etc.2 ... oxide, zinc/nickel/chrome plating, power coating, passivate, oiled to prevent rust, ect.3). A-Class supplier to key manufacturers.4). Members ...