I've used felt pics for over 30 years, when needed. Normally I play finger style with a floating thumb but if any particular song has extended fast tempo I'll cheat and use felt. Years ago the best out there were the larger green felt pics made by American Felt & Filter in Newburgh, NY. They didn't shed much as the fibers were longer but they did eventually become soft and self destruct. AFF supplied Steinway their piano felt for decades but they got away from supporting the music industry. I've scoured music retailers for these in my travels but few can be found. If you ever see any jump at the chance to buy them. It's kind of like finding a genuine tortoise shell pick for guitar & mandolin.