Musically Tuned - The Mongolian scale, a livelier version of the Chinese, is reminiscent of church and temple bells. In the mezzo and tenor sizes it contains all the notes of Amazing Grace. Our Mongolian chimes harmonize nicely with our Aquarian versions. Made in the USA - Music of the Spheres wind chimes are individually handcrafted and come in 5 sizes (Soprano, Mezzo-Soprano, Alto, Tenor, Bass) with 11 tunings (Pentatonic, Hawaiian, Quartal, Balinese, Chinese, Japanese, Mongolian, Whole Tone, Aquarian, Gypsy and Nashville) and the Westminster, Contrabass and Basso Profundo are offered in one unique size and tuning. All Weather - Tempered aluminum alloy tubing is custom manufactured to our exacting specifications and will never rust. Our finish preserves the wind chime's appearance and increases durability in hostile outdoor environments. Advanced Materials - Tough synthetic cordage is highly resistant to abrasion, and ultra-violet degradation. Central tube suspension with smoothly polished tube ends prevent cord abrasion typical of other, less labor-intensive tubular wind chimes suspension techniques. Detachable Windcatcher - With the same material and finish as the tubes, our windcatcher is the ideal size, weight, and shape for optimal chime performance in 8 - 10 mph wind velocity. The hook assembly provides a simple but effective method of varying the wind chime's activity level.