Armor razors are sharp, jagged blades that can be added to armor in the same way that armor spikes can. When you wear a suit of armor equipped with armor razors, you can deal extra slashing damage with a successful grapple attack. The razors count as a martial weapon. If you are not proficient with them, you take a -4 penalty on grapple checks when you try to use them. You can also make a regular melee attack (primary or off-hand) with the razors, and they count as a light weapon in this case.