light weight stem???

[giovanni]

I just recently bought THE STEM (I T M magnesium) and rushed home and put in on the gram scale only to see a horific site!!!!!! 137 gram's!!!!
what give's, I bought it in the 100mm size and figured maybe 100 grams
or so, but 137 holy crap!!!.
Did I just buy a heavy one or has any one seen a 138g The stem weigh this much, should I return it and have them weigh it before shipping or is this the norm?
Any advice would be greatly appreciated.
Thank's in advance
Giovanni.