From Binding of Isaac: Rebirth Wiki
- Adds a chance to fire razor blades that deal quadruple Isaac's tear damage.
- The chance to fire a razor blade is affected by Luck and goes up to a 100% chance at 14 luck.
- +0.4 tears.
- Tough Love: Tooth shots are overridden by the razor blades, though at under 14 luck it's possible to get both.
- Both the item itself and the description is possibly a reference to one of Isaac's nightmares between floors that involves him finding a razor blade inside a piece of candy.
- The item could also be a reference to the urban legend of giving away candies with razor blades as a way of committing murder.