I love the blackboard shapes from Cosmo Cricket! They are super smooth and super black! They are a great value for the price. Just buy it!
Punch out easily, good quality, make great additions to a page and not having any white outlines is great!
The thing I like best about these blackboard shapes is that they take color from watercolor pencils VERY well. I really like the flowers in this set. I gave it a 4 only because there are a number of random odd shapes that I really couldn't use, maybe they made them just to fill in space, don't know, but overall I LOVE blackboard products as they are very easy to alter.