Bells are handmade in Italy by craftsmen, not mass-produced in factories. 
Each bell has characteristic features from the process of being cut, hammered and shaped, then finally finished. 
Bells are brazed at the seams to keep a pure ringing tone that carries for long distance.
These two bells differ in sound, so you can easily tell the difference of pet based purely on sound.  
Great for situations where you don't have a direct line of sight to your dog. 
Bells have metal loops on the top of the bells. Loop is big enough to slide over a 1" wide collar. 
Hand-made Italian bells
Pure ringing tone
Bells From Italy