Medium Bi-Angle - 9" High Carbon Steel V shaped effect · Made in Nashville, Tennessee, U. S. A. · Extremely hard, high-carbon steel for brilliant shimmering response. · Graduated diameter. Each larger Bi-Angle is made from a larger size bar to get the best possible tone. · High temperature heat treating gives these instruments a full spectrum of sound. · Ultra thin satin surface does not adversely affect the natural sound of the alloy. · Each Bi-Angle is hand bent and tested by ear. (No factory style mass production.)