Compatible with All Major Brands: Designed to universal standards, VATOS Robot Building Bricks are compatible with your existing name brand building bricks. You can design your own models by adding more toys in. 25 Models in Total: 575 PCS of VATOS STEM Toys could be built into a big flexible robot and 12 city engineering vehicles, each vehicle has 2 forms. 25 models in total can maximize the hands-on ability of your child. Children always have endless creativity! Learn while Playing: VATOS Educational Building Sets could rapidly improve kids’ hand-eye coordination & manipulative ability and train their logical thinking & problem solving-ability during the building time. Kids’ Safety Always Come First: Every VATOS STEM Building Toy has been certificated to be Non-Toxic and Lead/BPA/Phthalate Free by the Third-Party Lab and exhaustively sterilized before they go on sale.  STEM SUPPORTED: Integrating boring Technological and Engineering knowledge and concepts into funny games, our STEM building toy is designed for 6+ years old children exclusively to improve their Science, Technology, Engineering, and Math skills at their most creative age.