Can heavy Valve Stem Caps throw off Wheel Balance?

[CajunGreek]

I bought a nice set of Valve Stem Caps that look like Piston heads. They turn out tobe made of brass and are quite heavy. Before I throw them on the car, I was wondering if that is likely to off-balance my wheels?

 

[cheapmiata1600]

There's an extremely easy way to find out...

 

[CajunGreek]

I bought a nice set of Valve Stem Caps that look like Piston heads. They turn out tobe made of brass and are quite heavy. Before I throw them on the car, I was wondering if that is likely to off-balance my wheels?

I put them on yesterday and no shaking or warbling noises. I'm just surprised that these things are so heavy. Now I'm trying to decide if I really like them because they're pretty large. I'll have to post a pic this weekend.