It's a good material, and I always loved the smell in these (weird?). Celluloid picks where the first I started to use, and I have a nostalic feel attached to them.
Seem durable and good quality. I love them in acoustic guitars.
"Jimmy Dunlop Celluloid picks sound great on a bass (Heavy) and on some single note melodic guitar lines. I don't use the faux tortoise shell ones because they are hard to see. When I hold a pick, I like to be able to see it clearly so I use white ones"