Recommended: Age 3+ years. Magnetic Tiles Building Blocks Educational Toys for Kids. Square triangles door and window frame shaped tiles. A great way to introduce magnetic chips for beginners. Made of high quality and safety tested for all American guide lines. Compatible with all other brands. each block is studded and riveted to enhance the quality of the tiles. The toy set is reliable, light, comfortable to touch and harmless to the human body and the environment.