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Complete pencils cleaning coin kits The kit of pencils for the cleaning of manufacturing coins 100% French consists of 5 wooden pencils. These pencils are the most appropriate and effective tool to remove scale, clean and preserve the patina on coins and on metal objects. All mines can be sharpened, but the pencil with chisel tip (scalpel). Mines can be sharpened with a penknife or with sandpaper or emery paper.