1. Identify jade from the color aspect: For green or bright jade, you must be careful when purchasing. If they are really jade, then the value is very high, the ordinary price is impossible to buy. In fact, as long as there is a little bit of green head, and the brighter color of the jade is already very good, the price is also in line with the average person's purchase level. 2. Identification of jadeite from the size: In general, the size of the jade pendant is 2x2cm, and the pendant is 3x3cm. But this is not a very rigid principle, and sometimes it depends on the preferences of the wearer to determine the size. If it is an emerald piece, then the size is not specified, but pay attention to the thickness. Because the thickness usually affects the jade head to some extent. The thin material is good, but it is lower. Fabric of Anti-static FR Safety Vest is special, this high performance fabric is inherently flame retardant, extremely hard-wearing and durable, with a soft handfeel and excellent drape providing exceptional comfort for the wearer, the most important of it is anti-static thread which provides the protection against electrostatic discharge in areas where there is a risk of explosion. We can also meet the EN 1149 standard. Anti-Static Fr Safety Vest,Fr Safety Vest,Fire Resistant Safety Vest,Safety Vest 3M Xinxiang Zhongke Reflective Material Co., Ltd. , https://www.safetyvest.pl