A perfect first stacker for baby! Inside each textured cube is a ball that rattles. But it does more than that! As little ones stack the cubes onto the elephant roller and onto each other, the weight of each ball aligns them and holds them in place. No more frustration. No more tears. Just easy stacking that encourages little ones to keep exploring and keep discovering! Roll into a happy tactile-learning adventure with the Lamaze Stack Rattle and Roll Blocks. Lamaze Stack Rattle and Roll Blocks Set of rattling blocks on an elephant roller designed for easy stacking Encourages fine motor skills, hand-eye coordination, exploration Balls inside cubes rattle to delight the ears Weight of balls align the cubes and hold them in place as they're stacked Cubes stack on top of elephant roller - Send the whole stack rolling! Cubes are also great for teething Includes elephant roller, 3 cubes with ball shaker inside High-quality materials and construction - Lasting durability, exceptionally safe for baby