Junior blocks for jumbo ideas! Kids love building castles, bridges and cities with these hollow wooden blocks. Lightweight and easy to build with, Junior Hollow Blocks are an ideal way to mix learning with play. Little ones will learn early math concepts, spatial reasoning, balance, gravity, gross motor skills and more as they build. Blocks are durably built and smooth-sanded for a perfect playtime experience. Wooden edges are rounded to help ensure safe play. Comes with blocks in 5 different shapes: square, rectangle, column, wedge and ramp.