Multilink Cubes connect on all six sides, making them a more versatile manipulative than the Unifix cubes. They come in ten each of ten colors: black, white, brown, light blue, green, dark green, red, pink, yellow and orange. Fully-interlocking cubes fit together to work patterns, operations, measurement, spatial awareness, problem solving, volume, area, geometry and symmetry. Snap together and pull apart easily.