I dont know how much mine were, but they are heavy as hell and ridiculously quiet. With the laudry room door closed (Kenmore 5het, super fast spin) i cant hear anything except a hum at ambient (any tv volume above ambient washes it out)...and its just a dull hum....The whole house has those doors and if you are behind two of them (ie, laundry room, then bedroom or some other door) then it is dead quiet.
Make sure you have a helper, i have taken them down for various reasons (extra wide furniture, etc) and it sucks very badly.
Its worth it to spend a hundred bucks on a good full length aluminum hinge jig with these, you dont want to try to wrestle one in place and have one hinge be 1/8" off.
(if you are doing whole house that is)