Booster 1013 is the largest unit of the Booster series and includes both a large tunnel, a mountain and a long bridge to connect them. Two cars can easily race through the tunnel side by side. Use it on its own or combine with the rest of the Booster series to really boost your imaginative play. Give your children's playtime a boost with the Booster series from Zpiiel. With this series your children can build creative landscapes to play with. Booster is a perfect addition to any playroom with toycars, trains, animal figures, small dolls etc.