The Graph Tech PQL-6643-00 is a pre-slotted replacement nut measuring 43mm long by 6mm wide, a size used by many Ibanez and PRS style electric guitars. It is made from TUSQ XL, which is impregnated with PTFE to make it self-lubricating and reduce string binding for improved tuning stability, particularly with tremolo use. The pre-cut slots speed installation, though minor height or slot adjustment may be needed. Graph Tech states the material increases harmonic content and sustain.