GraphTech PQM64400 TUSQ Acoustic Guitar Nut， Slotted， Martin Style， 1 3/4-Inch Length<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> 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 </span></li><li><span class="a-list-item"> Increase harmonics equals more richness and character in your tone </span></li><li><span class="a-list-item"> Its the difference between a four piece choir and a twelve piece choir singing every time your play a note </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31LLTLKPaJL.jpg" noproxy>