bow string question

Im not sure if this is in the rite forum or not but i was wonder wut a sundering bowstring does.

Armour Penetration (The result of using a Sundering mod on a weap) means that the percentage listed on the mod (e.g. Armour Penetration: 20%) is the percentage of armour on the target that is ignored in damage calculations. There's more chance that the Penetration won't happen, though. Sundering Mods never go beyond 20% Chance.

To use it, simply double click the string and then click the bow you want to attach it to.

ok thank you that helps alot