The blue bricks are solid and frost-resistant, exposed directly to the outside. They withstand strong winds and rain without issue.,Seeing the old man's hesitation, Yan Laowu decisively drew his knife and said: "Old man, blue bricks are 20,300 per unit, red bricks are 20,800 per unit, a total of 48,000.",Old Yan chuckled and said, "I brought some too, but I don't want to give them out today. Let's talk about it tomorrow."。