Strongest & Loudest: Fit puppy and cats. Round shape bells, diameter: 0.47 inches, Our bells are louder than most bells on the market. | Cat bell made of copper and the sound is crisper. Pet tag clip made of stainless steel and will not rust and very strong. | 4 bells, 4 rings and 2 clips per pack, easy to clip onto the pet collar different size D rings, It's a beautiful accessory for cats and dogs! | Helps prevent pets from escaping and you can know where they are at all times. | SATISFACTION GUARANTEE - We believe that you will love our cat bells. We will replace or refund if it is defective or if you are not satisfied with this pet bells.