Review (3/5): It's a good thing they come in a pack of two because ...
It's a good thing they come in a pack of two because on each one that I received, one end isn't fully functional. On one, the spiky end is deformed and unusable. On the other, the smooth side squeaks really badly (I bought them to help with migraines so the squeak is hard to deal with during that time). Other than That, they do the job and feel very nice and cool on the skin.