HR101 High Resolution Paper will give you optimised output resolution to create near-photographic images. This paper is great when you want high-quality color output to produce winning reports and eye-catching graphics. Use with Genuine Canon Photo Inks for true photo-quality output. Designed to help your colors stay in place and to be less susceptible to spreading and mixing, also known as "bleeding," delivering a more crisp and vivid picture. Printing papers are commonly ranked on a scale of 1-100, with 100 being the brightest option. The brighter and whiter your paper is the lighter your prints will be; a duller paper will produce more muted tones/darker images. This paper's brightness is 96/100. Weight refers to the durability of your paper and the amount of ink it is designed to hold without compromising the integrity of the document. Thinner/Lighter is ideal for quick prints, typography, rough drafts, etc. Thicker/Heavier is more commonly found in papers meant for photos, scrapbooking, crafts, etc. Normal everyday copy paper is 80gsm, very heavy thick glossy paper is 300gsm. This paper is 106gsm Genuine Canon paper comes in many sizes to suit various projects and applications, from 4x6 photo size for printing photos, to A3+ for printing photos. This paper's size is A3. Pack size is 100 sheets. Canon Product Code: HR-101NA3 Compatible with most Canon ink printers which accept this paper size - check your manual.