The Sigma Blade Zwei was a re-design of the original Sigma Blade, both signature models of Daisuke Shimada. Designed to be the "Ultimate Triple A" model, it featured YoYoJams composite body construction with weight rings meant to maximize weight distribution. A very tight design in a slimline concave, with super crisp metallic logos and stylized weight rings.
Pictured here is the first release in Deep Red from November of 2005. Of note, this first release featured Hybrid Response. Later editions used Double Yo-Ring Response.