PREMIUM QUALITY: We hand selected this specific ribbon for its clean look and durability. Not only does it look great but it is built to last. We manufactured the "Tinkle Bells" with a thicker nylon ribbon (1.0mm) that is sure to withstand the toughest tugs, scratches and bites! DURABLE BELLS: After an exhaustive search, we have identified the PERFECT potty training dog bell. With sound quality and durability in mind, "Tinkle Bells" are manufactured with large thick-walled jingle bells made from a specific blend of metals. This not only makes them sound great, but also gives them enough strength to resist stress from the most playful dogs. The bells are finished with a sleek silver coating that is sure to look good in any home! REINFORCED RIVET: In order to accommodate all doggy homes we added a high quality reinforced rivet that snaps open to connect around any door knob, handle, or hook.