The Ninja Chain Sickle is one of the Ninja's weapons. It has a spearhead like part on one end and on the other end is a small black and red sickle.
The Ninja can throw the sickle to act somewhat like the Ninja Scarf to wrap around the opponent to pull them down. The Ninja can also throw the sickle in order to slice an enemy. This weapon is frequently used by Randy, often on large opponents or multiple enemies.
This is Randy's second most used weapon other than the Ninja Sword.