This is a NEOTECH Brass Sling. Purchased about a year ago. Used indoors about 3 times. The Brass Sling was developed to alleviate fatigue in the neck, shoulders, and arms, which is common with large brass instruments. By distributing the weight over a wide area, it reduces the perceived weight by up to 50%, supporting long practice sessions. Also, there's no need to put the instrument down between performances, allowing for comfortable playing in concert halls or on the street. For euphonium, tuba, and baritone. --- Strap Supporter Standing Play