This is the instrument case that came with a used B♭ clarinet purchased from a musical instrument store in the United States. The material appears to be fiberglass. It's very durable. External dimensions (excluding hardware): Width 41cm, Depth 21cm, Height 11cm Accessory storage area size: 8.8cm x 6.8cm ... A K&M stand or a small reed case will fit. It's old, so there is some dirt and rust on the metal. I think it's good for ensuring the safety of the instrument.