Childcraft Linking Cube Set, 3/4 Inches, Assorted Colors, Set of 100 Linking Cubes are designed to be virtually unbreakable and create endless possibilities for building and learning. Cubes are 3/4 inches and come in 10 different colors. Recommended for ages 3 and up. Cubes can connect on all sides to create tunnels, interactive game ideas, and more Easily washable to help keep a healthy classroom Compatible with any program or publication that calls for 3/4 inch cubes Keeps kids busy for hours