Detailed Product Description Power Springs,Torsion Springs,Extension Springs We produce all kinds of springs,including plane worm spring,abnomity sping pressure ... worm spring,etc. The disc spring is high elasticity springs. And have good hardness and resistance to both ... to contact with us. JulenHaimen Zhengda Carbon Products CO.,LTD.Reifeng Industry Zone,Zhengyu Village,Haimen City,Nantong,Jiangsu ...