This is a reed case from Buffet Crampon. The following was generated by AI: Buffet Crampon is a famous French musical instrument manufacturer, particularly known for producing clarinets and saxophones. This case is used to store reeds for woodwind instruments. Since reeds are sensitive to changes in humidity and temperature, it is important to store them properly in a dedicated case. Various types of reed cases are sold at musical instrument stores and online stores. This case, being a Buffet Crampon reed case, is likely to be particularly familiar to players who use the company's instruments.