We have developed what we call a responsible products program, and we have shared this with the industry. We sat down with a toxicologist and looked at the accepted toxicological types of rankings of various fluids. As well, we worked with our suppliers, and even where there was confidentiality information we went in and signed non-disclosure agreements, on a company-to-company basis, so we had all the information that's in there.
We looked at the various components of fluids and decided, based upon their toxicological properties, that certain chemicals, principally due to their properties and their pervasiveness, presented a certain degree of risk, and that risk could be managed through operating practices or through avoidance.
We've decided, as a company, to avoid those certain chemicals that I mentioned.