A haunting new sound in chimes is now available. Our EchoTree has a unique tuning. It may look like the same 5 pitches are repeated over and over, but they're not. It begins with a group of five notes. That group repeats seven times over. Each time the sequence repeats it is lower in pitch. The effect is reminiscent of a siren that changes pitch as it passes you by. The EchoTree is hand-tied with our braided cord that can hold 50-lbs (we don't use plastic ties). 35 aluminum/titanium bars. Tennessee Black Walnut.