The PT-1200-00 is Black TUSQ XL 4 string slotted bass nut. It is a great option to upgrade or replace the nut on your bass. Black TUSQ XL is engineered from the same material as TUSQ and is impregnated with PTFE which is five times more slippery than graphite. It has all the tonal benefits of TUSQ, bringing out the hidden harmonics of your guitar all while drastically improving tuning performance. Dimensions: 41,02 x 4,62 x 8,84 mm. E to e: 31,09 mm.