Thick cardboard (gray on front and back) A4 20 sheets Thickness per sheet: Approximately 1.1mm Paper thickness is measured by an amateur, so there may be some errors. This is thick cardboard with gray surfaces on both sides. It's over 1mm thick and durable, so it's used for backing boards, core materials, packaging, patterns, crafts, etc. These are items stored by an individual. There may be scratches, stains, scuffs, and dents on the paper surface. They are not perfect. Also, there are limitations to accurately representing the actual color in the images. ⚠️Please purchase only if you understand and agree to these conditions. #SpecialtyPaper #Poster #Origami #Craft #FancyPaper #JapanesePaper #HangingBox #Letter #PaperCraft #Envelope #ThickPaper #Crafts #Calendar #Handmade #Collage #Pattern #Packaging #WrappingPaper #Printing #Label #Decoration #Stationery #Card #BusinessCard #ChopstickWrapper #Diary #Invitation #PaperMaterial #Catalog #Wrapping #BackingBoard #Cover #NoshiPaper #Menu #SmallEnvelope #PaperCutting #PaperTearing #BookCover #Mounting #Flyer #PaperBag #ThinPaper #Placemat #Printmaking #FlatBag #ThankYouLetter #ThankYouCard #PaperContainer #FolkCraft #HangingPaper #Chiyogami #KaishiPaper #NameTag #Tag #PriceTag #MinoJapanesePaper #IyoJapanesePaper #TosaJapanesePaper #KomaPaper #FlowerArt #FlowerArrangement #Chip70.5