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A plectrum is a tool used to pluck or strum the strings of your guitar. They come in a huge variety of materials and their tip shape and flexibility can alter your sound and enhance your playing.
Nylon and tortex are commonly used as they possess a good ratio of solidity and malleability. However, materials such as metal are also available for those seeking extra rigidity.
For strumming purposes, look for thinner, more flexible plectrums that will flex with fluidity across your strings. If you prefer to play faster and harder, a more rigid plectrum will be more responsive.