Sichaun Zhonglong has an in-house national standard laboratory, we have a regimented set of criteria of raw materials, the frequency of the inspections,check and tests of the semi-finished product and finished product to ensure they meet the declared performance standard, including durability performance. We do have the immediate actions to be taken when raw materials or finished products do not conform to the requirements of the national standards, includes but not limit to rectify the deficiency, identify and isolate the deficien rawmaterials and finished products and determine whether they shall be discarded.