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Either as a neck strap/harness replacement or addition - it can hold the weight of your saxophone in a very comfortable and easy to use manner. I was very impressed with its design and build quality.
Watch the whole video for an explanation, and demonstration using lots of different instruments:
0:00 review and explanation
4:00 Low Bb Baritone Saxophone (Conn)
13:22 Bass Saxophone (Conn)
15:28 Contrabass Clarinet (Paperclip)
16:52 Alto Saxophone
18:39 Low A Baritone Saxophone
20:35 Bass Clarinet
See more about it and purchase through their site: