Japanese brand Mnemosyne is known for their extra smooth paper and their highly functional products. Design is extremely minimal and so all the attention goes to what the product is for: writing, sketching or taking notes.
A4+ size, so pages removed at the perforations are A4 - ideal for filing or scanning later. A good size for notes and sketches - ideal for getting your ideas down on paper large enough to share them. Wire binding means it will lie flat, and not take up too much space on your desk.
All sheets are perforated for neat removal. Plastic front cover and thick card rear, to protect your ideas.