Yes these are mainly for girth. If you were long enough that you could hold an ok grip at midshaft, and then jelq from the base to there, that would work. I am a little over 7" but don't think I could do that. Perhaps someone who clamps might be able to say whether you could clamp midshaft if that would do the trick. I don't know if just stopping at the midway point would be very effective.
As for how the CC's grow I am not sure we do know. I am under the impression the large expansion causes micro tears similar to lifting. I have also read where some think the expansion simply makes the cells larger by stretching them and thus making them capable of holding more blood. I feel it grows through micro tears, because if it were simple expansion, rest days wouldn't seem to be necessary. Like any exercise, abuse it and there will be problems.
As for how the CC's grow I am not sure we do know. I am under the impression the large expansion causes micro tears similar to lifting. I have also read where some think the expansion simply makes the cells larger by stretching them and thus making them capable of holding more blood. I feel it grows through micro tears, because if it were simple expansion, rest days wouldn't seem to be necessary. Like any exercise, abuse it and there will be problems.

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