Black belt with stretch material. Simply hook the left and right metal buckles together. - Material: Rubber, elastic, adjustable length - Buckle: Silver Width: 3cm Length: Minimum 45cm, Maximum 78cm (measured flat without stretching), please allow for some error. When worn, the buckles overlap by 2.5cm, so a circle of 42.5cm to 75.5cm can be created. The rubber material stretches when pulled. Although I have never used it after purchase, there are marks from the fasteners on the back of the belt as shown in the fourth photo due to long-term storage at home. Also, there are two hook marks on the back (photo 6). I would appreciate it if you could purchase it with your understanding.