... . We are specialized in all various kinds of pipe joints1). Material: carbon spring steel, alloy spring steel, stainless spring ... you samples after you accept our price.6).My compay is a Sino-Ameirca joint venture,with YPAYMORE in the USA,specialized ... ,torsion spring,calipers spring,disc spring.It also produces high-pressure spring,suspension springs for various automobiles and mini-automobiles,front ...