Diameter 8.5 cm. Made with cupro yarn. It is characterized by its luster compared to cotton yarn. This is a handmade item by an amateur. There may be some twisting and overlapping of the yarn. Please take a look at the photos regarding the quality and purchase only if you are satisfied. If you apply force such as pulling or pushing, the yarn may loosen or change shape. Please handle with care. I hope you enjoy displaying it.