The Learning Resources Snap Cubes are specially designed to connect on all six sides. They have a plastic construction that is made for lots of play. The Learning Resources cubes are easy for little hands to connect and twist apart. They can be used in place of any cube and fit in Unifix apparatus and materials. The set includes an activity guide, giving you and your child lots of ideas for play time fun. The set has ten different colors, offering a vibrant play option for kids to enjoy for a long time.