| Length / | 838mm | ||
| Length of strings / | 488mm | ||
| Sound board / | German pine | ||
| Back & side / | Jacaranda, Rosewood | ||
| Fingerboard / | Ebony | ||
| Neck / | Mahogany | ||
| Coating / | Urethane | ||
| Price (ex-tax) / | NAcem-8 | 80,000 | Yen |
| NAcem-10 | 100,000 | Yen | |
| NAcem-15 | 150,000 | Yen | |
| NAcem-20 | 200,000 | Yen | |
| NAcem-30 | 300,000 | Yen |
It is tuned a 5th higher than the prime guitar, and creates a splendid sound when played with needles. It is necessary to play baroque music. By changing the thickness of the needles and the position of play, even the sound of the mandolin and the zither can be created. In 1957, when the Niibori Guitar Orchestra introduced the Niibori Guitar Chamber Music Ensemble, Dr. Niibori developed this guitar and added it to the ensemble. In 'Gavotte of Happiness op.6-10' that is loved as the academy's alma mater, the alto cembalo guitar takes the solo. After this introduction, the double string alto cembalo guitar was developed and it is often used in a guitar orchestra.