The blue bricks are solid and frost-resistant, exposed directly to the outside. They withstand strong winds and rain without issue.,Some people who are particular about things even use blue bricks for their kang beds. It's unnecessary, red bricks work just fine. The old man thinks they are even warmer than blue bricks.,The old man said, "These are all real prices, there's no need for you to inflate them. That's it, I'll give you six cents for each brick."。