This multi-colored 5 pack of balls is the perfect replacement for many ball popper toys. These balls are sized and weighted for compatibility with all Playskool brand ball popper toys, including Chase n' Go Ball Popper, Explore N' Grow Busy Ball Popper and Poppin Park Elefun Busy Ball Popper, but will work with other ball popping toys that require a similar sized ball. The balls are lightweight, yet durable and are easy for children to grasp. The balls feature a 1.75” diameter, hollow interior for added safety and easier “popping” and have some slight give when pressure is applied so the ball feels softer and will not get stuck in toys as easily. If planning to use these balls with a ball popper toy that is not Playskool brand, but please check the diameter of your current ball to see if these balls (with a 1.75” diameter) would be a suitable replacement for you.