Because bears frequently appear in the area, and I was concerned that the sound would be masked by walking in the stream, I figured "better safe than sorry" and used this extremely loud bell to complete the climb. I haven't used it since, and when I saw it again after a long time, it had the unique tarnish of brass, so I polished it. I customized it by adding rubber to the top so the body wouldn't stick to my backpack. I'm an amateur, so it's not perfect. Please understand this and purchase with no claims and no returns. The reverberation is long, and it rings out far. This is a bear bell that you can hold in your hand, attach to your bag, or wear on your waist. Size: 7.5cm diameter x 6cm height