Replacement nut made with TUSQ, synthetic ivory by GraphTech in black. To determine appropriate nut size, measure width of guitar neck at the nut (where peghead meets the fretboard). Professional installation is required. Nuts must be sized to fit and string slots filed to the proper depth. Blanks are partially shaped. Top edge is rounded over for speedier fitting and installation. • MFSKU 80513 • UPC 887766088868