2PC SET: This set includes two big wheels used to create trucks, trains, chariots, & any other moving vehicles. Compatible w/ HURMT36, HURMT70, HURMT83, HURMT102 HURTLE Geoworld Magnetic Building Blocks & other brands of standard size magnetic tiles SAFE AND DURABLE: This 3D magnetic building blocks wheels for kids features powerful and strong holding magnets and durable and non-toxic PC and ABS plastic w/ smooth edges to ensure childrens safety. It is also super easy to store and clean BOOSTS BRAIN DEVELOPMENT: Hurtle magnetic building tiles kids educational toys promote fun cognitive development, encourages critical thinking, and boost math & creative skills which are key factors for success. Suitable for kids, parent, & educator