It seems you're asking about a 1×5 ream box of Double A A4 Paper 80 gsm for printing and photocopying. This type of paper is typically used in home and office printers due to its high-quality smooth surface, which works well for both printing and photocopying.
A "1×5 ream box" typically means you will get one box that contains five reams of paper. Each ream usually contains 500 sheets, so this would give you a total of 2,500 sheets of A4 paper.
If you're looking to buy this paper, you can check online marketplaces, office supply stores,allmaxestore.com