LUXE BY MARTINTM bridge pins are just another example of the companys mission to constantly improve the sound and playability of our guitars. These high-tech pins are made of Liquidmetal®, a zirconium alloy that reflects energy instead of absorbing it. The result is an increase in volume and sustain without sacrificing the low-end or richness of the tone of the guitar. In addition, they are extremely durable and last significantly longer than most bridge pins on the market.