Chapter 748: Mutual Respect

Yi Yunrui pondered for a moment, "When was this mask developed?"

I believe that when Big Brother got this mask, he already had a general understanding of the mask.

"Not long ago, but you don't need to worry, this mask is not easy to circulate." Saying that, Yi Yuntian took the lighter out and struck fire at the mask, the fire just sputtered out and the mask caught fire all of a sudden!

In just three seconds, the mask had been burned to the ground, with nothing left.

This evaporates as fast as magic can say it's gone.

"This is a mask that will only remain stable and effective at temperatures between twenty-five and twenty-eight degrees. Lower temperatures will toughen it up and higher temperatures will vaporize it. Plus it's expensive to develop the mask, almost a six-figure gross uncle. No one would play with this if they didn't have a big heinous grudge. Plus the temperature control is difficult. I think those bodyguards just now, should be changed out