Griculture spring, spring teeth, hay rake teeth 1. ISO9001: 2000 2. imported materials 3. fully-automatic production Furun Springs are the Zhuji, Zhejiang ,China' leading compression, extension and John Deer spring tooth manufacturers.1). Material: spring steel 2). Finish: black oxide, zinc/nickel/chrome plating, power coating, passivate, oiled to prevent rust, and so on.3). A-Class supplier to ...