Mighty Muggs Head (hollow??)

[kevin]

i have a question, how come some muggs have a hollow head and some don't??? you can tell the difference by just tapping it.. i got 2 ironmans... and one head is hollow.. and the other is not... whats the difference? is one worth more than the other??

[Choche]

TBH i'm not sure, but i know what you're talking about... my Vader's head sounds hollow compared to Boba's one