Inner Diameter XS 55mm S/M 60mm L/XL 65mm All of our pieces are made from cellulose acetate. A mixture of cotton pulp and acetic acid. It is a biodegradable and eco-friendly material. Acetate is lightweight yet durable. Our acetate is sourced from Italy and Japan and then manufactured and finished in both China and Idaho. We are a small, Woman-Owned business located in Boise.