Double Bass Strings Flexocor Orchestra Strings Retail price: 22,990 yen. A friend purchased them for 11,265 yen. They were on the instrument for about a year. They've been used for a while, so I think they'll be ready to use on an instrument right away. I didn't feel any string degradation before replacing them. However, there is some slight wear at the position where the bridge touches. Please be aware and understand that they have been used on an instrument. Please consider them.