Little builders can create big castles with this set! Similar to real house brick, the castle bricks are made of cooked clay and completely safe for kids! Use the sand and corn-extract based mortar in order to keep your castle together. Then when you're ready to rebuild, simply soak in water, let the bricks dry, and start all over again! There's no limit to the amazing architecture your child can build, merging play, creativity and structure basics!