If it is standard X348, X458, X678 chain or trolleys,normally Zmie do not have minimum requirement.  For air shipment or Express mail arrangement, no minimum is required. But for your own convenience,if you wish to order for sea shipment,sincerely recommend order over USD5000, as you perhaps do not realize:     A. Importation for your Customs has minimum charge     B. Exportation for China Customs also has minimum cost     C. After importation from your Customs, you need truck arrangement before arrival to your warehouse or your customer's warehouse     D. Before exportation from China, Zmie also need truck arrangement to port     E. Sea-worthy wooden case needs to be built up as minimum package.