Hangzhou Sheng Zhong Covers Co,.Ltd is a professional and experienced diploma cover manufacturer and certificate holder supplier. With manufacturing facilities across worldwide, we have been serving 1000+ companies, colleges, universities, organizations, retailers, distributors and agencies nationally and internationally for over two decades now. We design, produce and sale full line of custom diploma covers, padded certificate covers, leatherette certificate holders, certificate frames, diploma tubes, autograph books to the distributor, wholesaler, retailer in worldwide.