Love these they light up work amazing in their runner toy and I love how it all connects in together keeps my 3 cats entertained for a while especially in the night

My cat loves it, he’s pretty old and doesn’t get much movement these days but these light up balls keep him moving around. A great buy and your cart will love!!

I bought these to go with the CatitA circuit toy and for solo play. The heaviness of them make them awkward for the latter but my cats love playing with them in the circuit toy. The batteries last a long time and I don't mind that they're not replaceable because that means it less likely for a cat to get access to them and they can play unsupervised with them. I like how durable they are and I haven't had a single one break or crack in 3 years.