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 switch 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: 20pcs each sets-Heat sublimation puzzle can be to make decoration or toy, bring more joy and fun.-You can disassemble the puzzle and reassemble it for drawing, or you can draw directly on the assembled puzzle to break and assemble.-Also, any your favorite photos and images could be printed on the surface, nice and durable.-Heat transfer puzzle is a nice opportunity to use your own design puzzles to express your imagination and creativity-The blank puzzles can bring joy to a fun family game night and can also be placed in a gift bag as a gift.5 x sets of puzzles