Ring Boomerang

Ring Boomerang (リングブーメラン) is Ring Man's Special Weapon. It has a somewhat limited range and, as its name implies, boomerangs back, but it can do multiple hits if aimed correctly. It's Dust Man's weakness, but Dust Man is immune to the Ring Boomerang when he has his vacuum on. It is also the weakness of Mothraya, Tako Trash, and the first form of Wily Machine 4. The Ring Boomerang can also pierce some shielded enemies, like Shield Attacker and Skull Man's Skull Barrier. In Mega Man IV, the Ring Boomerang can take items and pull them to Mega Man. Ring Boomerang can also destroy Garyobies.

The Ring Boomerang is also used by the "Bridge" in Mega Man IV and the Weapons Archive in Mega Man 10.

Ring Boomerang is the only weapon besides the Dust Crusher and Mega Buster to be able to damage the Cossack Catcher.

Damage Data Chart
Known damage values in units for Mega Man 4.

Capacity
One Ring Boomerang uses 1 weapon energy unit in Mega Man 4, and 2 Ring Boomerangs use 1 unit in Mega Man IV. With a full weapon energy gauge, Mega Man can use Ring Boomerang 28 times in Mega Man 4 and 38 times in Mega Man IV.

Bosses weak against Ring Boomerang

 * Mega Man 4: Dust Man, Mothraya, Tako Trash and Wily Machine 4 (1st form)
 * Mega Man IV: Toad Man

Other media
Mega Man uses the Ring Boomerang in the Mega Man animated series.

Ring Man's version is slightly different from that of the game. Instead of throwing them rapidly, Ring Man can summon infinite rings from his head using his left arm but throws them at a much slower rate.