Guitar plectrums / picks were originally made of tortoise shell. Today, they are made of all kinds of natural and artificial materials as well as variety of shapes.
Ibanez B1000SV Steve Vai Signature Picks 6 Pack (B1000SVMP)
Ibanez Guitar Picks Steve Vai Signature White Rubber Grip Heavy 6 Pack
Ibanez Guitar Picks Steve Vai Signature Green Heavy 6 Pack