A natural thread made from 100% silk with an elegant sheen.  
This High-quality Gütermann sewing thread is ideal for closing and backstitch seams, 
3-dimensional ornamental stitches and decorative seams
Hand stitched buttonholes
Medium to heavy-weight fabrics, woven fabrics and many other materials.
Soft, heavy duty, tear-resistant silk sewing thread 
thickness no. 40

Needle thread in combination with Silk S 303 as bobbin thread