Graph Tech's PQ-4025-00 TUSQ Nut Slab is a 1/4" block of pure TUSW that can make nuts and saddles that have a 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 nuts, saddles and bridge pins are designed to transfer the right frequencies more efficiently from the string to the guitar body.