"With my boys they wear alot of tags, they have to. This tag that tag rescue tag....you name it they got it... well at night all you would hear was the clattering of the tags!! Talk about annoying when your trying to sleep at 2am!! These things have quieted everything down! Just slip them over the tag and poof! I am not sure how long they last as they are just rubber, but considering they are super cheap and I get a full nights sleep they are so worth it!!"