This worn doeskin pouch holds a few unremarkable pebbles.

This pouch creates tiny pebbles that strike with the force of a catapult stone when thrown. Each stone has a range increment of 50 feet. You are proficient with the stones and must make a successful ranged attack to strike with one. A stone disappears after it completes its flight.
Activating a bag of boulders is a standard action that includes both drawing and throwing a stone. Each bag of boulders has 3 charges, which are renewed each day at dawn. Spending 1 or more charges when you draw a pebble from the bag determines the damage dealt by the stone when thrown.
1 charge: Deals 2d6 points of bludgeoning damage.
2 charges: Deals 3d6 points of bludgeoning damage.
3 charges: Deals 4d6 points of bludgeoning damage.

Prerequisites: Craft Wondrous Item, shrink item.
Cost to Create: 500 gp (plus 400 gp for base item), 40 XP, 1 day.