They are made of wood material. Blank puzzle is a fun way to create your own personalized puzzle. It is for weddings, showers, birthdays, invitations, and classroom or home activities. Decorating these puzzles is so much fun. You can decorate yours and with a friend to see if they can solve your puzzle. Features -Color:White -Material:Wood -Size:15.00X10.00X0.20cm/5.89X3.93X0.08in -Note: 35 pieces/set - It can bring joy to a fun family game and can also be placed in a gift bag as a a boys or girls' birthday party. - It will give you a chance to DIY, your creativity and imagination, thermal transfer sublimation puzzle can satisfy you. -With simple yet elegant look design and fine workmanship for practicality and aesthetics. - Any your favorite photos and images or other which you like could be printed on the Blank Jigsaw. - You can choose different photos to your heat press puzzle, such as family photos, vacation photos, , or favorite pet photos. Package list: 5 x sets of puzzles