Omnimed 2-1/2″ antimicrobial binder, side open, holds 450 sheets, aqua the omnimed antimicrobial binder’s combine a silver-base antimicrobial agent with omnimed’s heavy gauge molded tri-polymer binders will bend but not break. Their flexible strength and patented “twin-hinge” ring system give them unparalleled work life durability. The antimicrobial agent is added throughout the polymer and helps fight against mold odors and stains. These 2-1/2″ binders hold up to 450 pages. Side open style with 3 rings.