These Loose Leaf Refills have reinforced pre-punched holes so you can easily slide them into most ring binders. They also have a ruled margin so that you can keep your writing neat and tidy. These refills can be used to expand note taking capacities in binders. The paper is 70 gsm so you don't have to worry about ink bleeding through to the next page. The pages are A4 size making them convenient for everyday use.