The advantage of German enterprises is rigor, so is OKE. The snake spring produced by their company has strong deformation resistance, high resilience, softness and comfort, and is one of the top in the world. This kind of spring is used in domestic left and right sofas, so the left and right sofas are more durable and soft and comfortable to sit on. Old people and children can perfectly adapt to the left and right sofas, which is also related to the use of Okay springs.