... ,coil spring,sofa spring,seat spring,no sag spring. OKE clip knot (no sag spring parts), zigzag spring,no sag spring,sinuous ... 4).fixed clip distances, no need mark 5).eliminating friction and noise 6).used with Zigzag springs. 7).Code: CK-03 8).Packing ... : 2000pcs/box Our Clip strips inside the frame are made especially for loose cushion upholstery. OKE clip knot (no sag ...