Suction Bombs can be thrown and are able to attach to virtually any surface, including walls and ceilings. After a short period of time, they explode in a burst of ink. They are the slowest to explode out of any of the bombs.
Tips and Tricks
Suction Bombs have a larger kill radius than Splat Bombs
Since the have a long charge time, aim for where the player will be, not where they are
Suction bombs can stick to walls and ceilings
If you throw a Suction Bomb at the wall below a ledge, it can hit players on top of the ledge and vice versa. Use this to kill Chargers on ledges, or to prevent players from climbing onto ledges