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Old 01-14-2013, 01:27 PM   #8
Hadden07
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Join Date: Jan 2013
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Age: 34
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I think it happens due to the pressure of air and poor material of lip. Because I see many lips which are light weight and they never bear the much pressure of air. If you have buy this from a branded manufacturer then you can tell them about it.

Last edited by Hadden07; 09-26-2014 at 02:39 AM.
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