This is an assortment of thick paper (cardboard). The front is a matte white without gloss, and the back is gray. The sizes are 11 sheets of A4 size (21.0cm x 29.7cm) and 10 sheets of A5 size (21.0cm x 14.8cm), for a total of 21 sheets. The thickness is about 1.6mm, making it a very thick type. It is thick and sturdy, and I think it will be easy to use. How about using it not only as thick paper, but also for handmade crafts, as a backing board or material for creating works of art? *Please note that the wrapping paper used to package the product is reused due to the recent rise in paper prices. #paper goods #specialty paper #handmade #handmade materials #handmade supplies #papercraft #papercraft materials #papercraft supplies #craft punch #die cut #paper #paper #cardboard #white cardboard #white paperboard #chipboard #chipboard paper #Pokemon card packaging #thick paper #craft #paperboard #backing board #bookbinding #reinforcement #core material #photo protection #photo packaging #book packaging #A4 #A5