PremierTeam Gemini spring files in blue use a clever attachment mechanism that allows you to easily separate, add and remove any page. Blue Gemini spring files from PremierTeam are different to normal lever arch files or bingbinder type file folders. Instead, they use a detatchable spring that connects to a central prong so you can quickly add or remove any page from the file without moving any of the existing contents. This makes them convenient for documents you need to access or edit on a regular basis. Each folder is 356 mm x 254 mm (14 x 10) and made from 100% recycled 315gsm heavyweight manilla.