Only 6 pairs of tips received. I needed them so I used them instead of returning another set. Used them in a limestone rock. It turns out that there are harder and softer areas in the limestone. They generally didn't work in soft limestone areas because it was too compressible. Also, the pressed limestone dust is like crazy glue to these things, and I had to pound it with a jackhammer a few times. They worked well on harder limestone areas.