Safety print paperback 150x100x4Safety print paperback 150x100x4 This is a safe plywood that uses adhesives that are completely formaldehyde free. Plywood is made by layering and gluing wood grains together. It is thin but does not warp, so it is widely used for printmaking and crafts. It is a double sided flexible plywood that is easy to color. Considering children's health Harmful substances formaldehyde "zero" Formaldehyde is said to be one of the causes of "sick house syndrome"