Have these plectrum bought because of the good reviews, without having idea. The shipment took almost 8 weeks, so I was nevertheless forced to go to a music store. There I learned that I need more soft and thin picks for a classical guitar. However, this package is a mix of thin to thick, so I can from the 12 picks actually only use 4. Then the price into perspective massively. For durability, I can not comment. Who knows exactly what he needs, is well advised with the package if the content fits on the personal needs.