RuneScape Classic Wiki
RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Bronze dart tips
The Old School RuneScape Wiki also has an article on Bronze dart tips.

Bronze dart tips are made from a bronze bar at level 4 Smithing, granting 12.5 Smithing experience and yielding 7 dart tips. Using feathers with them will make Bronze Throwing Darts, granting 1 Fletching experience per dart.

Smithing dart tips require the completion of the Tourist Trap quest.