... 3.durable than normal cardboard puzzles NEW!! Sublimation Hardboard Puzzle Heart Shape 23pcsDescriptionNow LOPO promotes full series of sublimation ... MDF products,including photo frame,photo panel,puzzle,name badge,clock,key chain,luggage tage,coaster,door ... attractive display or gift giving.Detailsname: Sublimation Hardboard Puzzle heart shape 23pcthickness:3mmmaterial:hardboardGellary