Genuine Graph Tech TUSQ Nut Slotted 1.8 in PQ-6135-00 - New/sealed Genuine Graph Tech TUSQ Nut Slotted 1.8 PQ-6135-00 Manufacturers Part Number: PQ-6135-00 No matter what type of stringed instrument you have, the nut is one of the most important parts of the overall performance, playability and tone of your instrument. It is amazing the effect of upgrading this small part will have on the health of your instrument. When nuts are worn out or poorly constructed, problems such as string buzz, fretting out and tuning performance are just a matter of time. Graph Tech precision molds and engineers its nuts to create the most consistent tone, string balance as well as precise string spacing to create the perfect piece for your instrument. TUSQ produces more harmonics in the mid and upper range of the guitars. TUSQ nuts, saddles and bridge pins have harmonically rich tone, without the inconsistency found in ivory, bone or other natural materials. Bone and Ivory have hard and soft spots (grain) throughout each piece, hampering consistent transfer of vibrations to the guitar top. TUSQ has been designed to transfer the right frequencies more efficiently from the strings to the guitars body.