Zamak 2 comes in an ingot that weighs approximately ~ 4lbs (3.8lbs - 4.2lbs) and measures 1" x 2" x 8.5" with tapered sides. This alloy has the same composition as Zamak 3 with the addition of 3% copper in order to increase strength by 20%, which also increases the price. Zamak 2 has the greatest strength out of all the Zamak alloys. Over time it retains its strength and hardness better than the other alloys; however, it becomes more brittle, shrinks, and less elastic. Zamak 2 is also known as Kirksite when gravity cast as for use a die.