After the Smoking Kills quest, players can spend 300 slayer reward points to learn how to fletch broad arrows. This requires 52 Fletching. Players lacking these levels can purchase up to 3,000 at a time for 90 coins each, from the Slayer equipment shop, or spend 35 Slayer reward points to buy 250 broad arrows.
Broad arrowheads (found from Kurask drops or slayer masters) are attached to regular headless arrows to make broad arrows. Making broad arrows yields 15 Fletching experience per arrow, or 225 experience per set of 15. One can make up to 45,000 broad arrows per hour which is equal to 675,000 xp.
Making broad arrows costs 10.87 coins per experience.