These FUN and AMAZING balls make nighttime play more fun. They bounce really high, glow-in-the-dark, and have tails that wiggle like it's alive. Interesting and unique. colorful and handcrafted, Wiggly Balls help keep cats active, engaged, and entertained. They love to chase, run, pounce, catch and fetch these IRRESISTIBLE balls that light up the night. Glow-in-the-dark rubber balls measure approx. 1.75 in. and the polyester twisted tails between 5-8 in. Colors vary.