A plectrum is a device for plucking or strumming a stringed instrument. In guitars, banjos, and similar instruments, the plectrum is a separate tool held in the player's hand. In harpsichords, the plectra form part of the mechanism of the instrument.
I need a plectrum to play my guitar as well as I can.
Here you go, I have a bag of plectra, so you can keep it.