Ball Grenade

Winter Soldier Granades were special granades used by the Winter Soldier on his missions. There were saved by Bucky Barnes after he started recovering his memmories.

Battle of Washington, D.C.
While hunting Captain America, Falcon and Black Widow, the Winter Soldier pursued Romanoff through the streets of Washington, D.C., as the civilians ran for cover. Barnes soon believed he had Romanoff cornered when he heard her voice from behind a parked car. In an attempt to kill his target, the Winter Soldier dropped a grenade but soon discovered it was a trick and was ambushed as Black Widow jumped onto his shoulder and attempted to strangle him.

Capture of Winter Soldier
While Barner continued to ride away from Black Panther while the still determined JCTC agents followed behind in their cars. Coming to the end of the tunnel, Barnes used one of his granades to destroy the roof, hoping to trap his attackers and get away. However Black Panther was able to gain extra speed by jumping on Falcon's back and knocked Barnes off his bike before Captain America kept him from killing his friend.