Buying these at such a low price, I wondered if that would mean that the binding would be flimsy and the paper too thin. I was willing to try since, if nothing else, they could be scribble notebooks while working.They far outdid my expectations!The big permanent Sharpie markers will go through the paper, sure, but their fine liners don't at all. Neither do BIC's Intensity fine liners. My Zebra Mildliners, Pentel Inkjoy gel pens and even my Gelly Roll gel pens all stay clear and clean with no seeSee full review