They are made of a sturdy cardboard material. Beautiful glossy white on the front and matte white on reverse side. Coming up with your idea on how to decorate this puzzle is half the fun. Decorate with crayons, markers, pencils, rubber stamps, paint and much more! You can get to decorating right ! The puzzles come preassembled and stay together until taken apart. They won’t break off while you design it. Features - Color: White. - Material: Paper. - Size: 18.5 x 0.5 cm. -Note: square, round, star, heart shape - The four pieces of the puzzle contains: shape, one heart shape, one square shape and one round shape. - The puzzle pieces are easy to separate and assemble while the mats have straight cut, non-beveled edges - Helps to train children's hand- -ordination skills, develop creativity and imagination, foster logic thinking, expand knowledge, and more. - Puzzles can be decorated with oil and water-based artist paints, mediums, inks, watercolors, markers, pencils, crayon, and other drawing materials. - These blank puzzles are great for crafting with children or any DIY enthusiast! Package list: 8 x Kids Coloring Blank Puzzles