... (Sofa parts),zigzag spring,sinuous spring,coil spring,sofa spring,seat spring,no sag spring,belong to sofa part. metal spring clip ... ,no sag spring,sinuous spring,coil spring,zig zag spring,sofa spring,seat spring,back spring belong to sofa part or sofa ... optimum clip distances 3).supplied in rolls or cut to length,if required. 4).Load: up to 80kg tensile strength per clip 5).soundless ...