121PCS Base 10 Blocks setBox Yellow Decimeter Cube: Hollow (light), can be either one unique cube (closed) or box-like. Size 10x10x10cm - 1 pc, 10x10x1cm - 10 pcs, 10x1x1 cm - 10 pcs, 1x1x1 cm - 100 pc.
Super STEM Skills: From science and technology to engineering and math, STEM learning help kids build critical thinking and other skills they need for success in school and beyond!