Expand foundational unit block sets with just the pieces your builders need more of. Made to align with the same mathematical dimensions as traditional unit blocks, these add-on sets are designed to be used as an enhancement to foundational sets.
The pieces line up perfectly with the unit blocks we already had, so my four-year-old can stack them into taller towers without any wobble. I wish the set had more of the long rectangles, but the eight pieces we got get used every single day.
I bought these as an add-on because my kid kept running out of the long rectangular pieces, and now the towers actually stay up. They line up exactly with the blocks we already had, so nothing wobbles.
These fit perfectly with the unit blocks we already had, same dimensions so the towers don't wobble. My 3-year-old gravitates to the longer rectangles every time, and now there's finally enough to go around.