This is a set of D'Addario "Prelude" 4-string strings for a double bass (contrabass). These strings were removed from a brand new instrument immediately after purchase and have been stored at home unused for about 2 years. It is unknown how long they were on the new instrument, but there appears to be no discoloration or deterioration due to aging. Although unused, they are considered used items, so the condition of the product is listed as "no noticeable scratches or stains." D'Addario Prelude strings are well-regarded as all-around strings, and their relatively reasonable price makes them popular for use on upright basses and silent basses, in addition to double basses. The new retail price including tax is 20,790 yen. Shipping will be on days other than Tuesdays and Thursdays.