I bought a dozen of these picks in Nov 1987 from another company. (I wrote the date on the bag). I use this pick for electric guitar. Picks definitely impart tonal properties, and this is the pick I've stuck with. They impart a thicker sound which I like. The highs are subdued a little. They can be a little hard to hold on to. They are smooth and very long lasting; so long lasting that I am still using the same individual pick after all these years. If I drop it on a dark stage I look till I find it because it is now an heirloom! I like purple but wish they came in bright yellow also.