Professional Grade Earplugs are earplugs that have only appeared in the episode "Sweet and Sour Squid."
The earplugs are a light magenta color, and they fill the user's ear to block out noise.
Role in series
Plankton wears them after having his ears nearly injured because of Squidward's bad music. He later loses them, which leads to Squidward's clarinet being destroyed and Plankton's arrest.
|| "This plan Z can't possibly fail!"