The EXBOLT 63, introduced in early 2021, is the newest string in the YONEX string family. With a diameter of 0.63mm, it is one of the thinnest Yonex strings. We also subjected the YONEX EXBOLT 63 to a long-term test as part of our test of the two latest YONEX ASTROX 88 S PRO and ASTROX 88 D PRO rackets. In addition, the testers of the BADLAB bat troop dragged the EXBOLT 63 onto their personal racket for comparison in order to ensure the most objective possible assessment.

The extraordinary feature of this particularly thin nylon multifilament string is the innovative coating with "FORGED FIBER". This very thin outer coating, specially developed for this, promises a high level of durability and should therefore put an end to the short-term life of thin strings. Of course, this makes the hearts of string lovers who prefer to play thin strings beat faster.

In contrast to the currently thinnest string from Yonex, the AEROSONIC with 0.61 mm, which is preferably played in popular sports and is only used by professionals as a cross string in a hybrid setup (YONEX AEROBITE / YONEX AEROBITE BOOST), it already stands out The new EXBOLT 63 is very popular with top players.

Evaluation: Our test has confirmed: finally a thin string that doesn't break that quickly, offers excellent recoil force and with an impressive sound. The fact that this string doesn't break that quickly is certainly due to the new "FORGED FIBER" coating. In our long-term test, we used the stringster app to document the development of side tension and elasticity over a period of almost 2 months. Our feeling from the active test that the string tension remains stable for a longer than average has been confirmed.

With the EXBOLT 63, from our point of view, YONEX has closed an important gap between the BG 66 ULTIMAX and the AEROSONIC. Our testers welcomed the fact that the EXBOLT is available in 3 different colors (black, white and yellow). The black string with the white Yonex logo in particular is a real treat for optics lovers.

BADLAB recommends the new YONEX EXBOLT 63 to all players who not only want to feel a filigree string but also want to hear it. Regarding the string tension, we recommend 22 lbs to a maximum of 26,5 lbs.