UniLink Linking Cubes, Pre-K to K, 1,000 PiecesColorful, easy to manipulate cubes connect and stack on one side and are perfect for investigating patterns, numbers, measurement, area, volume, graphing and geometry. These plastic, 0. 75 inch cubes come in 10 bright colors. For over 50 years, hand2mind has encouraged hands on learning and discovery, driving deeper understanding and helping children unlock their full potential. hand2mind specializes in math manipulatives designed to help students