Like the sliding puzzles we did when we were kids, but with a twist. Complete one side of these heavyweight, solid wood puzzles, then flip the pieces over to complete the second side. The custom art expresses the duality of day and night. An heirloom gift meant to be completed time and time again. 18 pieces plus "remove me" placeholder. 6.5" x 7.5" x .5" completed puzzle with frame. Materials: Basswood. Contains no formaldehyde.