They are made of a sturdy paper material. Blank Jigsaw 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. Make it as challenging or easy as you desire. Features -Color:White -Material:Paper -Size:18.00X13.00X0.20cm/7.07X5.11X0.08in - DIY craft supplies, you can use these paper pieces to make a puzzle toy. Good paper pieces are durable and does not fold easily. - These puzzles pieces with , smooth surface, no burr, safe for use. workmanship, small crack, close combination. - The package comes with enough puzzle pieces, large quantity for you to use, meet your different needs. - These are heat transfer puzzles, you can get your phone or picture printed on them. toy, help to improve your kids' fine motor skill and brain development. Package list: 15 x Sheets Templates