This is thick paper (cardboard). The front is a glossy white, and the back is gray. The size is 29.7cm x 20.0cm, which is almost A4 size (29.7cm x 21.0cm). The thickness is about 0.5mm. The number of sheets is 50. It is also quite thick and I think it is easy to use. As well as thick paper, how about using it for handmade crafts, as a backing board or material for creating works? *Please note that the wrapping paper used to package the product is reused due to the recent rise in paper prices. Thank you for your understanding. #papergoods #specialtypaper #handmade #handmadematerials #handmadematerial #papercraft #papercraftmaterials #papercraftmaterials #craftpunch #diecut #paper #paper #cardboard #whitecardboard #whitecardboard #chipboard #chipboardpaper #thickpaper #craft #cardboard #backingboard #bookbinding #reinforcement #corematerial #protection #bookpackaging #magazineprotection #magazinepackaging #cardprotection #A4