This is Compal's "Bear Repellent Bell (Large) Set of 2". Uses: For bear repellent and attention when mountain climbing, foraging for wild vegetables, or during commutes to/from kindergarten/school. Features: Comes with a convenient clip for attachment. Size: Bell size is approximately 37.5mm or 43.9mm in diameter (depending on product variation). Material: Iron (plated), etc. Although new and unused, there are a few small scratches from the beginning. Please refrain from purchasing if you are sensitive to such details.