... spring,sofa spring,seat spring,belong to sofa parts OKE clip strip 4870, (spring parts),zigzag spring,no sag spring,sinuous ... is commonly used: (pitch:18,loop height:48)(2) OKE clip strip No.4870 (used with Zigzag springs) 1).significantly time-saving ... 2>.Knot distance:120mm, packing: 144m/rollOur Clip strips inside the frame are made especially for loose cushion upholstery. OKE clip strip 4870