Dont trust size genetics! they are a scam. i was sooo unsatisfied when i received my extender. It's this crappy little plastic contraption that doesnt even work. the springs that came with it were stuck so it wouldnt even stretch my penis. I thought the whole point of extenders was to stretch your penis to increase its length? i tried calling them...i tried emailing them..and then when i finally got hold of someone they told me that all i could do was ship it back(at my expense) and they will try to fix it and ship it back(at my expense) ...sounds like a pretty good scam to me..and meanwhile they have just charged me 60$ on top of what i originally paidd..garbage product