Instrument case. Flute case? (Based on the image) The product description from the seller was for a flute case. I needed an outer bag, so I bought this. Hard case Size: Approximately 40cm x 9cm x 5cm Black (blue interior): Unused Price is for all four. I bought a set like the one in the last image, but I only used the outer bag, so the inner hard cases are no longer needed.