Toddlers like repetition. Filling and spilling, stacking and knocking down are perfectly delightful activities. Stack & Fit Cups invite play with bright colors, graduated sizes, and smooth, rounded corners. Nested the cups resemble flower petals. Stacked a skyscraper. Raised rims facilitate successful stacking and keep cups from sliding. The play value of Stack & Fit Cups goes beyond nesting and stacking. Think water play and sand play, as scoops and containers. Imaginative play props. Storage for favorite findings. Stack & Fit Cups develop cognitive and fine motor skills, inspire imaginative play, introduce mathematical concepts, and enhance language development. Graduated cups measure 3 1/2″, 3″,2 1/2″, 2″, and 1 1/2″ square.