Masterwork Weapons and Armour

The following are my homebrew rules for Masterwork Weapons. These fine examples of superior craftsmanship are rarely available for sale, but when they are, sell for 200% the normal price.

Masterwork Weapons: These beautifully crafted items inflict +1 damage.

Masterwork Armour: Though they weigh the same as their mundane counterparts, when worn, they are considered to be 25% lighter due to their fine balance and materials. Furthermore, the reduce non-magical slashing, piercing and Bludgeoning damage, the amount depending on the category of armour;

Light Armour: 1 point
Medium Armour: 2 points
Heavy Armour: 3 points.

This stacks with similar reductions from feats or similar.