These envelopes are high quality paper. There are plenty to do what you want with. They work well with crayons, gel pens, and chalk markers. They are fun to decorate and definitely add a clash of elegance to your letters or whatever you're mailing. I like how they don't ruin your artwork like the white envelopes do when you put through the mail. They are harder to get dirty and look fantastic. Metallics look so good on these envelopes. I even threw a cute wax seal on it and it held well. These are A+ envelopes.