This is a SAITO Guitars S-521b 5-string bass. It's a JB model that showcases SAITO Guitars' unique functional beauty, with an arched top body and a recessed joint plate. See below for details. https://www.saitoguitars.com/work/s-521b/ The color is Ash Naked (natural) with a satin finish. The controls have been changed to 2 volumes and 1 tone. The three knobs have been changed to HATA knobs. Also, the pickups have been changed to "EVERTONE JB5 Class-S Set -For Wood Custom Guitars-". The selling price is 85,800 yen, making it a rather expensive pickup. See below for details on the EVERTONE pickups. https://evertone.official.ec/items/71592800 The Class-S of the EVERTONE pickup is characterized by its fast attack, but it has a switch that allows you to fine-tune that speed. The tone pot is a push/pull type, and when pushed in, it produces the "fast attack sound of the original Class-S," and when pulled up, it produces a "slightly slower (looser) sound." There isn't a huge difference, but I think it has an effect as a fine adjustment to match the song. The specifications are as follows: ・Body: Ash ・Scale: 34 inches ・Neck: Maple ・Fingerboard: Maple ・String spacing: 19mm ・Pickups: EVERTONE JB5 Class-S Set ・Controls: Front Volume, Rear Volume, Tone There are minor scratches and dents from use, but it is in generally clean condition. The neck is currently almost straight. I tried moving the truss rod a little, and it moved without any problems. The string height is about 2mm on the 1st string and 3mm on the 5th string at the 12th fret. The weight of the bass itself was 4.2kg when measured with a health meter. There is no crackling in the electrical system. In addition to the bass body, a genuine semi-hard case (no signs of use), a spec sheet, and a warranty (warranty period has expired) are included. The parts before the replacement, such as the pickups and knobs, are not included.