I bought mine in the quilting section at Joanns and thought they were very sturdy.
I accidentally FMQed over two - thankfully, my machine did not hit them. Then I had to take them out without breaking the stitch. I had a heck of a time bending and twisting to get them to break. I finally spread the curlicue at the bottom of the pin the moved the stitch through it. They were like iron.