Let imaginations run wild while teaching spatial thinking with our standard sized Crystal Connectors. The Crystal Connectors allow children to build in all directions! It promotes perceptual and fine motor development while encouraging cooperative play. Add the Crystal Connectors to your group setting and children can create imaginative structures, increasing in size while students engage in STEM building concepts such as problem solving, balance and engineering design skills. Our Crystal Connectors are perfect for light table exploration allowing children to visually see color mixing and reflection properties while constructing 3D structures. Our Standard Sized Crystal connectors measure ranging 1 1/2" - 2 ½” diam. and come in a variety of brilliant colors – red, yellow, blue and green. Each durable plastic disc has 8 slots for building and balancing in all directions. Our 300 piece set is an ideal addition to classrooms, preschools, and the home environment. It can be cleaned with a mild soap and water mixture and a soft, damp cloth. For children ages 3 years .