Description de chez Amazon UK : - GraphTech Black TUSQ XL Ukulele Nut<br /> - Graphtech Black Tusq Xl Nut - Slotted Ukulele<br /> - Designed to boost guitar performance, TUSQ XL is precision engineered and specially formulated to bring out the hidden harmonics and richness in every note.<br /> - TUSQ XL is based on the highly resonant TUSQ man made ivory and impregnated with PTFE, the slipperiest substance on earth, to improve the tuning performance of the guitar.<br /> - Improved tuning stability, improved harmonic content<br />