Tools used for the purpose of killing. Contestants1) are able to purchase such tools at Sheila's Shack o'Shiny (or the Scavenger's Workshop)2)3)4) in exchange for requisition.5)

There's a list of weapons.

1)
And newbies
2)
If they are able to time travel back to Season 1
3)
Some of us can.
4)
But which ones?
5)
And in some cases, cigarettes