Each month a different art project with all of the supplies needed (except water,) is shipped to you. Shipping is always just a flat $5 fee. You can cancel at any time. If you have already been charged for that month, you will receive that last box. The regular size accommodates up to 2 people while the Family Size accommodates up to 5 people so the whole family and/or friends can participate. Great for gifts and homeschoolers.