Striker

The Striker is a raft powered by Ace's fire. It is water-proof. Shown first during Ace's fight with Baroque Works Billions ships. He seems to be comfortable and confident in it, and it seems to "sense" when he is coming, such as when it resurfaced during the Billions fight. Apparently, he uses it when not on the Moby Dick, and is quite like Aokiji's Bicycle