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Sketch cards are small, hand-drawn and often one-of-a-kind pieces of artwork created on trading card-sized paper. These cards typically feature a variety of subjects, including characters from popular media, original illustrations, and portraits. Artists use various mediums such as pencils, markers, ink, and watercolors to create intricate designs on these cards. Sketch cards are commonly collected and traded among enthusiasts and are prized for their unique and personalized nature.