Come and see how the Playgo Junior Marble Run Extreme Set is built and be entertained by how the marbles run down. The Playgo Junior Marble building techniques can apply to any of the other sets by Playgo. A beginner's set perfect for little builders and marble racers. When building the construction, kids can develop hand-eye coordination, logical thinking, creativity, colour and shape recognition. We have already upgrade the quality of this marble set. They made of solid transparent ABS, absolutely non toxic, not easy to break or snapped. Smooth edges avoid scratching hands. Ideal Marble Building Set Gift for boys and girls. It's best for children party favour, after-school fun, birthday and Christmas gifts.