Skylar Aluminum Wind Chimes 38” WindChimes for Outdoors, Brushed Copper Bells, Garden Patio Lawn Inspirational and Memorial Wind Deck SK-SKWCCPR36 6 Aluminum-Alloy Copper-Coated Tubes: The Skylar windchime features 6 individually tuned tubes measuring 12/13/14/15/16/17 inches respectively. All 6 tubes are constructed from aluminum material that not only makes them more weather-resistant, but better sounding in terms of resonance, tone, pitch, and overall sound quality. A beautiful, brushed-copper finish graces each tube (as well as the suspension dome,) with a regal, aesthetically captivating allure. Centrally Strung Tubes: Unlike most windchimes that have holes drilled in them (for the cord to run through), the tubes in this windchime are strung to a single cord that is tied to a central pin inside each tube. The difference? A clearer, more resonant, and better-toned sound that is more pleasant to listen to.