Logical Prime Notebook offers a smooth, contemporary writing experience with its high-quality paper. Designed for those who prefer a sleek surface, the paper allows pens to glide effortlessly, making it ideal for quick, efficient writing. Its 7mm W-Ring design ensures organized note-taking and a flat layout for ease of use. Fountain pen-friendly like the Yu-Sari Notebook, the Logical Prime stands out for its superior smoothness, offering a silky writing feel perfect for sketching, jotting, or detailed note-taking, complementing your workflow with precision. <Size> B5 / W7.17 x D0.20 x H10.12 <Color> -Brown(point) -Gray(Grid) -Blue(Line 6mm) -Green(Line 7mm)