Give your young builders the blocks they need to think and build big! Our grid blocks connect safely and securely so children can build entire playhouses, castles or tunnels to crawl through. Giant Blocks come in six bright primary and secondary colours that will continually look new because the colours are molded right in. Square block measures 12" x 12". Blocks are available in a 16 piece set, 32 piece set and a 48 piece set.