This is a bear bell from Montbell. It's lightweight, but makes a loud rattling sound with even slight movement. I have several bear bells and am offering this one for sale as I'm not using it. This item is designed to alert wild animals, such as bears and wild boars, to the presence of humans. It comes with a carabiner, allowing for easy attachment to backpacks or belt loops. The carabiner is designed to prevent rotation. Specifications: Material: Carabiner: Aluminum alloy / Body: Steel Weight: 36g Color: White (WT) Size: 26 x 50mm (carabiner) / Φ38mm (bell)