RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Tinderbox
The Old School RuneScape Wiki also has an article on Tinderbox.

A Tinderbox is an item used in the firemaking skill to light fires by burning logs. A fire can be started by dropping a log and then using the tinderbox with it. Tinderboxes can be bought from every general store.

Item spawns

Location Number of spawns Number in stack
On a table on the top floor of Draynor Manor 1


Dropped By

Monster Combat level Quantity Rarity
Imp 5 1 3Uncommon
Zombie 24 1 3Uncommon