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Search results show Kryptonite-themed comics available in both hardcover and paperback editions.
Most comic volumes list a suggested age of "22 Years and Up," while the apparel items list the suggested age as "Adult."
Authors shown across the results include Dan Slott, W. Maxwell Prince, Darwyn Cooke, and Dennis O'Neil.
Item descriptions state the shirts are printed in the USA, mention a dye-sublimation printing process, and also note hand-printing in some listings.
The apparel listings state "Number of Pieces: 1" and list the included item as a top.
