Our Enigma US Letter Quarto binders feature a quality 3 D ring mechanism* for secure storage and \na frosted clear hard polypropylene 1200micron cover allowing the first page to be \nviewed through the cover.\n* D ring mechanisms are fitted inside the rear cover \nkeeping your pages in line. Far better than using O ring mechanisms\n--High Quality Frosted Clear US Letter Quarto Polypropylene Portrait Binder \n\n--First page can be viewed through the cover \n\n--3 D 25mm ring mechanism with 40mm spine. Holds 23mm of paperwork\n--Capacity of approx. 50 pockets (allowing up to 100 sheets of 90gsm paper if placed back to back)\n--Binder dimensions 300 x 266 x 40mm spine\n \n \n