Sunglong Biotech, based in HangZhou City, Zhejiang province, China, and focus on elisa kit, assay kit, antigen, antibody, Pcr kit and so on products, they are all for life science research only. As an manufacture, good quality and the best technical support are our top priority. We choose fedex , dhl , ups , EMS to send kit out with ice bags, it can save a lot of transportation time to make sure the box is in tip-top condition. There are some other factors will effect the quality of kit, such like transport, people, weather and so on, we will send the new replacment kit to you directly or you can apply refund after we confirmed the kit dont work or damaged. We can do our best to protect your rights.