Fb Track City Toy is construction toy set comes with an easy assembly manual, kids need to think about the track direction, the shapes, and assemble it. All can help them develop hand-eye coordination, logical thinking, creativity, color and shape recognition, spatial imagination ability._x000D_ _x000D_ Safe Marble Set for Kids. This building toy is made of solid transparent PVC, absolutely non toxic, not easy to break or snapped. Smooth edges avoid scratching hands. Pieces stay tight, not easy to get loose when play with it.