Miniature Explosive (5e Equipment)
From D&D Wiki
Simple Ranged Weapons
Miniature bombs are often employed by rebels who can’t obtain more substantial siege weapons. They are typically constructed out of a small, brittle body packed with gunpowder and capped with an easily ignitable cord similar to a match head.
Explosive. On a successful hit, every creature within 5 feet of the creature hit must succeed a Dexterity saving throw equal to the attack roll or take 1d4+2 fire damage. This weapon deals double damage to objects. Once used, this weapon is destroyed, regardless of whether or not it hit.