Memory Book Swinging Shutter Page Protectors 12″X12″-Super Heavyweight Clear 3/Pkg. C-LINE PRODUCTS-These protectors have a built in panel on both the right and left edge that close to meet in the center like a shutter. Simply open the 2 shutters to reveal what is underneath. The universal hole punch on these wholesale discount cheap bulk page protectors works with 3-ring strap and postbound albums. The extended binding edge allows pages to lay flat, (1) 12"X12" & (2) 6"X12" Pockets