The radula of cones are like tiny harpoons and needles. They are used to deliver potent conotoxins to envenomate their prey (fish, worms, and other mollusks).
These particular radula, each just under 12mm in length, were extracted from:
Gastridium geographus (Linnaeus, 1758) (left) and
Pionoconus striatus (Linnaeus, 1758) (right)
These two species are piscovores (fish eaters) and their venom, among several others, can kill. Many species may not but their potent sting may result in a trip to the ER. Always handle cones with care.