It arches in carbon fiber, invented from the M°. Claudius Righetti in 1989 in collaboration with the M°. German Urs Maechler, is the fruit of search and experimentation. They are entire handicraft and for this, beyond that to by hand introduce the oneness of the typical piece of the product entire constructed, they are personalizzabili in order to adapt itself to the musician and its instrument. In the realization of an arc some variable ones that can be controlled are: the weight and its distribution, the force and its distribution and the balance. On the same model of arc reinforced zones can in fact be created or softer in order better to adapt it to the requirements of the musician. The arc in carbon has a sound extremely cleaned up without the classic rustling dell' arc in wood and in knows guarantees it of the optimal performances. The pluriennale experience in the field, the contact and the continuous monitoring of the requirements of the musicians, has allowed to fix some parameters and to create some models, taken from the great tradition dell' French archetteria. This has allowed to reduce the times and to contain production expenses in order to offer to a product of highest relationship quality/price. Therefore the musician can find already ready of arches with differentiated characteristics that, on the whole, they answer to the requirements that in the course of these years we have seen to be shared from the majority of the musicians, (also solisti of international reputation, which the violinista Isabelle Van Keulen, Holland, the violoncellista Natalia Gutman, Russia, the violinista Kioko Takezawa, Japan, the violista Steve Dhann, Canadian, solo in order to cite the most known).