The PQ-3834-00 is the perfect option to upgrade the nut on your 4-string Bass guitar. Flat Bottom. It is pre-slotted for a quick and simple installation. TUSQ nuts and saddles have rich tones without the inconsistency found in ivory, bone, and other natural materials. Bone and ivory have hard and soft spots (grain) throughout each piece, hampering the consistent transfer of vibrations to the guitar top. TUSQ nuts, saddles, and bridge pins are designed to transfer the right frequencies more efficiently from the string to the guitar body.