My five-month-old kitten loves this toy. the balls sound like bells and each ring will move separately. assembly was very easy only need to use one screw at the bottom of the toy and they screwdriver was provided and good quality too. The one drawback is it heavily smelt of chemicals. like filled the whole room with that smell. we washed it in soap and water and now it has no more chemical smell. My kitten adores it and I am so glad I got it for her. My kitten is bangle and Maine coon mix so having toys she can think with is a must.