All Parts coming in contact with the container of the aluminum cap or exposed to the atmosphere are made out of Stainless Steel for long time.Variable Frequency Drive for Speed Control.InfeedExit Star wheel is equipped with Safety Clutch for automatic stoppage of machine in case of jamming andor overloading. Spring Loaded Free Spinning Sealing Rollers eliminate any damage to aluminum caps & allows greater flexibility of variation in the container neck dia.Unique Sealing Rollers Impart uniform, Scratch free, fit tight and reliable skirting and sealing.