Blue Classification Folders 6-part or Central File Folders. These folders come in deep red, moss green, royal blue, blue, yellow, red, green, gray, pale green, A. green, A. red, and peridot made up of 25 pt. pressboard covers and Tyvex Gussets with 1" prong fasteners to keep files secure. There are two Kraft inserts with 1" fasteners attached to give you a 6-part folder. 100 folders per box.