These translucent magnetic tiles give children a fun way to explore geometry concepts…as they build! The durable plastic tiles have magnets built right in, so they stick together from every side—as kids explore symmetry, area and perimeter, angles and more. Perfect as an expansion to other Magna-Tiles® sets (sold separately), this set includes 8 tiles in 2 shapes (diamonds and pentagons) and assorted colors; pentagons measure 4 3/4".