1.STS-4020S uses advanced circulation technology and special manufacturing. The wind orientation can be adjusted and the shrink effect is good. 2.The heating elements are stainless steel which has a long life span and high energy efficiency. 3.The use of French Schneider inverter controls transmission speed which has the function of infinitive speed. 4.Imported insulation curtain greatly reduces the heat loss. 5.The shrink temperature, conveyor speed and air volume are adjustable. 6.Visual window makes the shrinking process more clear. 7.The conveyor uses new types of rollers covered with durable imported fiber tubes which have the functions of anti-high temperature, wear resistance, non-film damage, non-deforming and long terms using; The roller can choose rotating or non-rotating to meet different shrinking f different products.