Crystal Color Stacking Cups are an amazing resource to introduce color mixing and early STEM building concepts in the classroom or the home environment. See, hear, touch and play with these fun, lightweight cups specially designed with grooves for stacking up as high as you can build them. Then enjoy the crisp sounds they make as they topple over each other. Right side up, or upside down, the cups are easily stack-able into simple or complex forms, and are great for learning how different structures work together to support one another. Overlap different colors to explore color-mixing concepts, and then stack them up on a light table for even more fun as you see your creations become brilliantly illuminated. A nice manipulative for developing fine motor skills and STEM and STEAM concepts. Sorting and patterning becomes a fun activity! A teacher’s guide is included. For children ages 3 yrs. . Our Crystal Color Stacking Cups measure 2” x 2 ½” and come in a set of 50.