It is was invented by American Norton in 1978, which is a new type random packing.In Domestic market, it also called Intalox Metal saddle ring. In the 70s ending, we also invented two similar products. One is Metal rectangular saddle ring. Other is Metal Double arc ring./IMTP Ring SADDLE Ring Metal  PACKING METAL 410IMTP Ring SADDLE Ring Metal  PACKING METAL 410 Two side’s turnup increase packing’s mechanical strength and stiffness. Meanwhile, the stamping annular ring also increase packing’s comprehensive strength