Our letter size blank manila dividers with write-on tabs are manufactured from 110# heavyweight manila index stock. Our side tab dividers are 1/6th cut and have 1/2" tab extensions with clear write-on mylar, that you can write on with a pencil or marking pen. The mylar covered tabs are also more durable. The dividers are two-hole punched on the top and side for filing convenience. Order individually by tab position or in collated sets.