High-quality material: Domino set uses high-quality, safe and non-toxic plastic. Plastic edges are rounded and smooth without edges or corners, which improves safety and stability. It makes parents safe and makes their children happier. Easy installation: after you insert two AA batteries into the train toy, you can turn on the switch to play (you need to prepare the batteries yourself). Domino Placement - Insert the domino slot into each end of the slot. Child safety: these plastic domino products are made of non-toxic plastic, which is safe and does not fade. The edges are smooth to ensure the safety of children when playing. We do not recommend it for children under 3 years. Cultivate childrens multiple skills: Domino is a leisure activity that promotes creativity and strengthens self-confidence. It is good to develop the intelligence and creativity of the participants. More importantly, you can promote participants will and teamwork. Holiday Gift: This is the perfect gift to stimulate childrens thinking. Children can play together at the party and have many happy moments. Parents can also interact with their children. Suitable for children over 3 years. Specification: Pack size: 33 cm x 8 cm x 23.5 cm. Power supply: 2 AA batteries (not included). Products include: 1 x Domino Train Plastic block x 60. 1 x cactus.