Keystone is set up in 2019 and specialized in plastic and sewing products,including bags,folders,display book,Envelopes,document case, expanding file and so on.Our products have been exported for overseas for years and got the good market feedback, especially for Japan, US and Europe Market.We have more than 10000 square meters production area and 300 employees. Adhering to the principle"Quality First, Customers Supreme", we provide our clients with our best products and service to make the mutual benefit and development together.