This is an accessory that came with a used instrument. Although the details are unknown, it is believed to be the same type of case as the Carlo Giordano BSC-300. However, the size is considerably larger than a 3/4 (domestic 4/4) size. When a 3/4 size instrument is stored, it not only has extra space but also feels quite bulky. In addition, there are some tears, scuffs, and stains, especially on the bottom of the bag (photos 3-6), but it can be used without any problems. (Please note that the shoulder strap is missing.) I am selling this because my instruments are mostly 3/4 size. Since "bigger is better," those who don't mind can purchase it for a 3/4 size instrument, but I recommend it for those who have a 4/4 size instrument. (I was able to store a 5-string bass, which is slightly larger than 3/4 size, but it seems to have less space due to the thickness of the padding compared to the CBA-1 type case that is also being sold.)