Mascot curtain spring fully use the feature of small change force of constant force spring to easily adjust the height of the curtain to let the curtain to stop in the ideal height. This curtain constant force spring throughout the whole process can also change the force of the part of the spring section. The spring material is made of high-quality stainless steel with 0.05-0.16mm thickness and 3-20mm width. The service life can reach 5000-10000 times. Welcome to contact us with your drawing sheet or data( spring thickness, width, working length, inner diameter, outside diameter) . we are pleased to provide you with cost effective products.