The TreeWorks Studio Recording Triangle (TRE03-6) is a 6-in. triangle made of extremely hard, high-carbon steel to get the best possible tone. Tempering at over 500 degrees gives these triangles a full spectrum of sound. Ultra-thin zinc surface does not adversely affect the natural sound of the alloy. Each triangle is hand bent and tested by ear (no factory style mass production). Made in the U.S.A. Comes with a full-size professional stainless steel triangle beater/striker and holder.