I purchased 2 packages of 10 because I found a good sale on them. I used them on my last baby quilt with bias binding and LOVED them! I could only do a portion of the binding at a time which was the only draw back I found with my limited supply. I found the 50 count a couple of weeks later at a great price and free shipping so I grabbed them. Now I have 70 of them and I should be able clip the whole binding on a baby quilt! I haven't tried a larger quilt yet but if I need to, I'm not unwilling to buy more! I am sooooo tired of pin pricks in my hands, arms, chest and legs when I do my bindings!