Super loud bell: Our bell is very loud. Each bell contains a stainless steel minimum motion clapper that makes the bells very sensitive to ringing with even the slightest movement. High-Quality Materials: Our bells are handmade in our factory using copper, which is durable when exposed to the elements. Cats and dogs especially spend a lot of time outside, so these bells are built to last. Efficient tracking: Our bells allow birds and small wildlife to hear when your cat or dog may be approaching, giving them time to escape, and help you track your pet when it's out of sight. Perfect size: 16 mm, product weight: 10g including split ring, ideal for smaller cats. The lightweight bells will not burden their bodies. Suitable for cats and dogs, as well as some small animals. Package includes: 4x Extra Loud Cat Dog Bells, 2x Rings. Specification: The loudest, clearest, most durable handmade bells available. Copper, expertly welded by hand to produce outstanding quality. Minimum motion clapper rings the bell with the slightest movement. High quality and customer satisfaction are our priority. We hope our products serve you well.