Usage Tips:Extra Loud Cat and Dog Bells: there is a stainless steel minimum motion clapper in each cat bell, which can make a loud, clear, and pleasing sound at the slightest movement, very nice for training dogs and cats . Easy to Track Your Pet: you can quickly find your dogs and cats after wearing these dog bells for collar, you dont have to worry about your pets will lost when taking a walk in the rural road or going into the bushes . Reliable Material: these pet tracker bells are made of quality copper, not easy to wear or get rust when exposed to the elements, reliable and long lasting, very suitable for pets outdoor activities . Size Information: each pet tracker for cats bell measures about 0.87 inch in diameter, suitable for most small medium and large pets,each set including 2 bells, you can split them between 2 pets if you wish . Practical Gifts: the cat bells for collars loud are cute in appearance, practical in function, which are very nice gifts for your pets, they can produce crisp ring to remind birds and other animals not getting close to the cats and dogs, and reduce the chance of being caught to save more wild animals .