I guess not many are going know about thicker picks. However, 5mm is not an uncommon thickness for gypsy jazz or metal players. And it should be more common for bluegrass flatpicking and jazz. Thicker picks are perfect to add presence and volume to an acoustic instrument. And this one, with it's unique material, has a very clear sound. Much prefer it to gypsy jazz picks made of softer material or some of the oddly shaped boutique picks for metal guitar. Overall, this isn't my first choice for an electric archtop where I want a bit more subdued tone. But it is very good and will be my primary for a flat top or gypsy jazz guitar. And it's quite comfortable to hold and play. Well made. One of those 'expensive but worth it' things. And, if I don't lose it, the material will last a lifetime. If I do lose it, I'll buy another.