Getting 100% of all the product details on paper is crucial when ordering from Chinese factories. Firstly, it helps you recollect and verify all the order details. Secondly, it sets the ground for efficient purchasing conditions negotiation and most importantly for quality levels that you require on your order. Quality is not universal. Do not assume a Chinese supplier will match your quality level without a proper explanation. They produce similar goods for different countries (Russia, South America, North America, Europe, India), and all of them have different quality standards. Consider getting help from a professional sourcing company.