... spring,sofa spring,seat spring,belong to sofa parts OKE clip strip 4870, (spring parts),zigzag spring,no sag spring,sinuous spring ... is commonly used: (pitch:18,loop height:48)(2) OKE clip strip No.4870 (used with Zigzag springs) 1).significantly time-saving ... ).soundless under strain 6).Stapling on wood and metal frames 7).no marking, only put on the frame and fix with ...