We are specialized in all various kinds of disc springs:we can offer you samples after you accept our price. Furun Springs are the Zhuji, Zhejiang ,China' leading compression, extension and torsion spring manufacturers and disc spring suppliers.1). Material: stainless steel, carbon steel,alloy steel,aluminum,etc.2). Finish: black oxide, zinc/nickel/chrome plating, power coating, passivate, oiled ...