An award winning blocks brand, all the materials used in Botzees Toddler - Coding Train Set are BPA free. The block system is made by better materials that come in rounded edges, making it unique and perfect size for smaller hands. The blocks are also designed with a building joint system that is movable, making it easy to take apart– encouraging kids to build more than one creation. To top it all off, a free app with 3D zoomable building script is also included in the set that inspires self-determination and an overall fun building experience.