Write a review Your name* Your e-mail* (Not for publication) Rating ★★★★★ Excellent ★★★★☆ Very good ★★★☆☆ Average ★★☆☆☆ Poor ★☆☆☆☆ Terrible Your review * * — Required information Harmonic Series Inc ← View details 2601 South Lemay Avenue #7, Fort Collins, CO 80525 +1 970-673-7437