11x17 4" Post, White Vinyl View Binder (520980) Product Type:Post Binders Media Format:Landscape, bound on shortest side 3 layers of vinyl sealed to create a heavy duty ribbed hinge 2 colored layers of 12 gage vinyl, and a layer of clear 7 gage vinyl, sealed over rigid .135 pt. chipboard panels Fastener System Hole Spacing:Standard 3 Ring, (Three) Rings, 4.25" (4-1/4 inch) Center to Center.