I'm not sure but I think they're full of buckwheat hulls. If they are, expect that it will be putting more pressure on a smaller area than you are probably used to. Also buckwheat hulls are rather noisy although they do a good job of keeping you cool.
I have shoulder problems and I toss and turn a lot so I have a soba gara makura (buckwheat hull pillow) that I use so I speak from experience.
Again, I have no idea what they're filled with for sure. I had one of those round neck pillows filled with hulls so if it's similar you might have slight pressure pain if you sleep on your ear.
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