Sassy Stacks of Circles Stacking Ring STEM Learning Toy, 9 Piece Set, Age 6+ Months. Stacking Rings has never been more fun with the Stacks of Circles! The center of each ring is the same size, allowing it to be stacked in any direction for frustration-free play. The Stacks of Circles promotes early STEM learning by teaching a child about sorting, size sequencing and building. This developmental toy has many features including play where baby can experience cause & effect scenarios and recognize high contrast, black and white colors. This sensory and educational toy makes a perfect shower gift. It includes a ring that can be used as a rattle. Stack any way! The straight post allows you to stack the rings in any direction, strengthening hand-eye coordination Count to 8! Each ring features a different color and texture Chunky sized rings make it easy for baby to grasp, strengthening New in bag