These FUN and AMAZING balls bounce really high and have tails that wiggle like it's alive. Interesting and unique. colorful and handcrafted, Wiggly Balls help keep cats active, engaged, and entertained. Cats love to chase, run, pounce, catch and fetch these IRRESISTIBLE balls. Recommended for cats of all ages these balls help keep them happy and healthy with the necessary enrichment indoor cats need. Balls measure approx. 1.75 in. and the polyester twisted tails between 5-8 in.