The BOTTOM QUARK isn't really on the bottom, but has been known to engage in bottomonium. It is also part of the Quark 6-pack.
Bottom Quark is a heavyweight particle plush but also comes in a lightweight shipping saver version which is especially nice if you live outside the U.S. So if you prefer it to be filled with lightweight stuffing, just choose that option at checkout and it will only weigh in at 2 oz. Of course you won't get the full effect of its Bottom Quark massive weightiness but it will be the same in every other way.
Approximately 14 oz (397 gm); 5.5 inches (15 cm) across.
For ages 5 and up as it contains glued-on/small parts.