This is a guitar pick for Martin guitars. I've used various picks in the past, but this one is undoubtedly the easiest to use, sounds great, and doesn't slip. It was expensive for a single pick, but I felt it was definitely worth the price. (I bought it new at a shop for about 2700 yen) I haven't even used it for six months yet. Here's the description from the internet: The edges are beveled, allowing for different playing feels and sounds depending on which corner you use. Made of a special polymer, it produces less pick noise and comes with anti-slip stickers. Available in the classic triangular and teardrop shapes, each with two thicknesses. Thickness: 1.0mm Thank you. Martin Gibson gibson Acoustic guitar Acoustic guitar