If you work with paper in any capacity, you should have this great tool. Traditional and beautiful to hold and work with, a bone folder is ideal for smoothing surfaces, creasing folds, and scoring. I have two, both real bone. They are not expensive, less than $10.
Here's a place to buy online if you can't find them in a local stationers or crafts shop.
Here's a place to buy online if you can't find them in a local stationers or crafts shop.