So they make a Tempera Hybrid string suitable for a C extension? Every time I go on this thread I contemplate these strings more and more; but I plan on getting a C extension this year.The biggest adaptation I had to make as far as touch was on the E string, which on my bass is an extension E that they made for me. It's not common in Europe as far as I know but they did it and it's good. The difference in the amount of force used for the string is quite small between choking it and getting a good tone and volume. Once I figured that out it made a huge difference and opened up the whole concept even more.