The coolest manipulative we've seen in years! Super powerful magnets enclosed in a rainbow of building shapes! Geometric shapes adhere on every edge, with magnets that spin freely to ensure that every side attracts to other pieces. Brilliant rainbow colors virtually guarantee interaction. It's also an engaging way to build problem solving and visual spatial skills! All magnets are safely encapsulated in the durable plastic, making Magformers the safest magnetic toy available! The 30-piece set includes 12 triangles and 18 squares.