This B5 spiral notebook features 7mm college ruled lines, offering ample space for writing. Each page is dated and numbered, so you can jot down important notes, fill in the date and page or topic number for quick reference later, keep your notes well-organized. The set includes 4 notebooks, letting you customize the covers to tell different subjects apart, a total of 320 sheets (640 pages) that can last up to 320 days if using one sheet per day. It has a firm, flexible double spiral binding that allows 180degree(s) flat lay and 360degree(s) flipping, making it easy to turn pages and tear off unwanted sheets, works comfortably for both right and left-handed users. The sturdy twin-wire binding also has a wide enough pocket to hold a pen. Made with premium 100 Gsm thick paper and a waterproof hardcover crafted from thick cardboard, it protects the inner pages and lets you write or draw even while standing. Available sizes: Graph, Lined, Unlined. Available colors: Black, Mint, Pink