content: EDIT: In the past several months I have owned this product these bowls the rubber has "hardened" and no longer smells. So most likely the issue is that the rubber must "cure" over time. I still highly recommend these.------------------------------------------------------------------------------------------------From the other reviews, and my own experiences, I believe there must be two "grades" of this product. I bought the ones with higher sides for my dogs. They are wonderful and don't smell bad. The "rubber" on this bowl is more like latex, it is very smooth and stiff.BUT, when I bought the 12 ounce version intended for cats I found that the material was VERY different. While the "rubber" is the same color, it is a completely different material-- more of a spongy, flexible material and it smells very much like tire rubber. I bring my new cat home tomorrow, so hopefully she will take to this bowl and I won't have just wasted $14 (I bought them at Petco).