Dear Michael Ruiz,
Thank you for your review of our Whistling Tubes. We're thrilled to hear that you find them fun and that the price is great. We appreciate your feedback and support. It's fascinating to learn about your experience using these tubes to teach physics at the university level. We're glad to hear that these particular tubes have a unique feature, allowing you to produce the first harmonic, among other tones, by twirling them gently. That's truly amazing!
We understand the importance of having different types of tubes to teach physics most effectively, and we're glad that both the Carnival Source tubes and the Arbor Scientific tubes serve different purposes in your teaching. It's wonderful to know that your grandkids also enjoy the tubes as party gifts, regardless of the harmonics.
If you have any further comments or if there's anything else we can assist you with, please don't hesitate to reach out. We value your input and look forward to serving you again in the future.
Thank you for choosing Carnivalsource.com. We truly appreciate your business and your recommendation.