Constant Force Spring,constant torsion spring,stainless springFeatures: 1) Dimensions: 0.13 x 12 x 700mm 2) Material: SUS301 Constant Force Spring,constant torsion spring,stainless springFeatures:1) Dimensions: 0.13 x 12 x 700mm2) Material: SUS301 Constant Force Spring,constant torsion spring,stainless spring