This is a pre-tied obi made from a repurposed half-width obi, styled in the "Karuta Musubi" knot. The material is unknown. It is not silk. It is a relatively thin and soft obi. Obi width: Approximately 17 cm Karuta section: Approximately 37 cm Fits waists up to 100 cm A string is sewn onto the end of the obi. Velcro is pre-attached to the Karuta section. After adjusting, attach the included Velcro. Fabric has been joined to the ends of the obi. Please consider this if you are not concerned about it. This is a handmade, repurposed item. Please consider this before purchasing. Thank you for looking.