The PQ-1200-00 is TUSQ 4 string slotted bass nut. It is a great option to upgrade or replace the nut on your bass. TUSQ delivers a rich tone, crystal clear bell like high end with big open lows and a significant increase in harmonic content and harmonic sustain. Increase harmonics equals more richness and character in your tone. Its the difference between a four piece choir and a twelve piece choir singing every time your play a note.