PUPTECK 2 pcs/set Puppy Dog Potty Training Doorbells Doggie Housebreaking Housetraining Tinkle Bells,Cute Cartoon Pattern 24" One set includes 2 pcs training bells,very cute cartoon pattern,pretty pink angel and light blue cakes. Prefessional design,conveniently open top snaps to connect around any door knob,handle,or hook,reachable for most age/size dog. Reinforced rivet,thick nylon fabric,tough and durable,strong enough to resist stress from playful dog and resistance to bite in the initial trainging stages. Proven as an effective method for housebreaking,housetraining,potty traing for your doggy. You hear gentle jingle of doorbells,instead of barking and scratching,an easier,better way for you to communicate with your poochie.