The Fox CVC bocal is an early version, which would later be replaced by the Double Star *CVC* bocals. CVC bocals are an excellent choice for advanced high school/college students.
Fox CVC bocals are silver plating on nickel silver tube and available in lengths 0 through 4, with 0 being the shortest. Lengths #1, #2 and #3 are the "normal" lengths. Avoid the extreme lengths #0 and #4 without good justification.
**Nickel plating is also available upon request at no extra charge.