Bronze bolts
From Emps-World Wiki
Bronze bolts can be created using the Fletching skill, at level 1 Fletching. Attach a couple feathers to Bronze bolts (unf), that can be made out of Bronze bars with 1 Smithing. They can also be bought at the Archery Emporium and are used to make Opal bolts and Barbed bolts
Bronze bolts can be used with any crossbow and give +10 ranging strength.