At the first glance, you will say WOW, it looks so cool, as you simply cant find any glue mark.... Then you may feel it, WOW, it feels so good, so smooth, the parting line is just so neat... Situated such a great result, Primitively Puzzled, then amazed, impressed further, eventually ascertained,that is the phase what you will definetely come across phycologically plus psychologically... hush-hush,That is the magic of our ultra sonic welding....