They might be casein. I don't think Fender is going to tell us. Here's the description from Fender's website.
"Fender's Tru-Shell picks replicate the highly desired, unique sound of the Hawksbill Sea Turtle shell without harming animals in any way. Crafted from organic natural proteins, the distinctive composition creates full-voiced bass with crystalline treble tone—making Tru-Shell picks ideal for acoustic guitarists. The natural lubrication avoids binding on the string for precision playing. Color selection is random and colors will vary.
Tru-Shell picks are not plastic. Do not attempt to flex; keep away from moisture."
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