It is a device that helps to control the thread tension on the two needles of a sewing machine It consists of two tension discs two tension springs and two tension regulators that can be adjusted independently It allows the user to create different effects and patterns on fabrics by varying the thread tension on each needle It can improve the quality and durability of the stitches by preventing loose or tight threads It can enhance the appearance and creativity of the sewing projects by enabling the user to create decorative stitches pintucks hems and more