These celluloid, pear shaped (351) thin picks are ideal for my style of acoustic guitar strumming with occasional picking. I don't like the excess volume of stiffer picks and love the way these can produce both a gentle strum and be ramped up to a non-aggressive firmer volume without drowning out vocals, like heavier picks can. They are thin to hold and a quite smooth, but with practice can be held without dropping. I find I can adjust their position while playing because they are smooth. The flexibility gives a nice clean sounding strum with a pleasant, not too loud, string noise. Not being an aggressive player I have never had one break or disintegrate. I've tried lots of pick materials, shapes and thicknesses but have always gone back to my old black Gibson light, so this pack lets me keep several in each guitar case ready for use without hunting.