We have been cooperated with Alibaba on trade assurance.Trade assurance is a service by alibaba designed to creat trust in trade, providing buyers with a set of features and protections to help ensure suppliers honor important details of the contract. If supplier does not meet the shipping time or pre-shipment product quality requirements in the contract, Alibaba.com will refund up to the covered amount for your order. You can choose Trade assurance order.And we also welcome you to our company to check the quantity.