Super fun for your kids to play! Push one and watch the chain effect of the dominoes tumbling over like a race. See whose domino row runs down to the end fastest. Kids can assemble it into different kinds of models according to their imagination as well. Put the dominoes into the card clip and then put it on the train. The train will move forward and lay dominoes automatically while twisting left and right slowly. Our Domino Train Blocks Set is made of high quality plastic which is, no BPA or any other harmful substances. This set is suitable for children. Each edge of dominoes with circular arc design is smooth polished without burrs, making the dominoes smooth to touch. You can keep it for along time