Nonstick insertable binder features recyclable polypropylene material that is environmentally friendly and will not stick or lift copy from cover inserts or contents. Use the clear overlays on front, back and spine to customize your presentations. Locking round rings are mounted on the back to let pages lie flat and reduce wear on your important papers. Heavy-duty, recycled chipboard core is designed for heavy use. Binder also offers exposed rivets and two clear inside pockets for loose documents..