The quiver Holds arrows similar to how the bundle holds your extra items with one key difference: way more storage space. When the quiver is in its Curios slot, the arrows in it will be used first before taking out of your main inventory.

Arrows have been expanded as well adding iron, gold, diamond, and Netherite arrows available in both regular and tipped forms. These generally increase in damage* as the material gets more expensive. Additionally each arrow type has a different Gravity** causing the arrow to drop faster or slower depending on this value.
The mod changes the texture and name of the vanilla arrow to look more consistently like a flint arrow as the current arrow already looks too much like an Iron one.

* note that damage will scale and change based on your bow as well
** the gravity values are not based on any sort of metric, so use them more like relative values to one another

Along with this you can now cycle the arrows in the quiver to change which stack is used first. To do this click the Hotkeys Z and X. This comes with a hud display that shows you the first stack to be used along with the last stack and next one. This display is only shown if you are holding a bow or crossbow and appears next to your offhand slot.