Puzzle double gray paper refers to double gray cardboard made from recycled waste paper, which is an environmentally friendly packaging material.Jigsaw double grey paperJigsaw double grey paperAs the primary material for puzzles, widely used in children's brain-teasing puzzles, adult stress-relieving puzzles, and more. Beyond puzzles, it is also utilized in various packaging scenarios such as handbags, luggage, furniture lining boards, gift boxes, cosmetic boxes, notebook covers, and hardcover book covers.