Tianjin grewin technology co., ltd. (tianjin, china mainland) is a professional manufacturer toroidal transformer, current transformer, encapsulated transformer and inductor, etc. we have updated production lines, we have obtained vde, ce iso9001 certificateds. you will certainly find some models that are competitive in your market, if there is any question or request, please contact us freely, we will try all best for your satisfaction. so that we can offer you our detailed quotation. we are looking forward your favorable reply.