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 curved pieces fit perfectly with our existing unit blocks, which surprised me since I wasn't sure they'd match. My four-year-old has been building arches and tunnels all week instead of the usual towers. Good weight to them too, they don't slide apart easily.
My kids always fight over the curved pieces, so having six more that match our standard unit blocks exactly has been a game changer. They stack flush with the old set with no wobble, and the curves finally let them build arches and bridges that actually hold.
I added these to our existing block bin and they match the old pieces perfectly, same dimensions so the towers stay flush. The curve pieces finally let my daughter build arches that actually hold, and six extra units was exactly the right amount.