Base Kit Part Pack Bundle

If you have a Four Player Kit and want to upgrade to a 6 Player Kit, get this Base Kit Part Pack Bundle, which has the additional parts. If you have no kit at all and want six players, get the complete six player kit instead. You could also just get this part pack for the parts themselves.

Expansion Kit (adds 5-6 player ability, requires ownership of any Stabilizer Kit, adds these additional parts):
11 land hex supports
4 long water borders
11 number holders
2 port holders
1 robber holder
25 intersection clips
2 legacy compatible ports chits
1 dragon