The Leo Nunchaku is a signature weapon of Ultraman Leo. It was created with the smoke stacks of a factory's chimney and Leo's psychokinesis. The weapon was rendered unusable after Alien Kettle destroyed the tops of the weapon with his spear.
Concept
An article of a Comic Rise Magazine for 2nd graders explained that Leo was originally planned to have a weapon like Ultraseven, whom Leo succeeds. The nunchaku was only ever used once however, and was eventually replaced with the Ultra Mantle as Leo's weapon.
Gallery
The smoke stacks prior to Leo using them as weapons
Leo creates the Leo Nunchaku
Leo holds the Leo Nuchaku
Alien Kettle uses his spear to destroy the Leo Nunchaku