SpinAgain is just like stacking rings, with a literal twist! Thread the rings on the spiral pole and watch them spin downward until they rest on the reversible base. While they vary in diameter, all the rings have the same size center hole, so they can be stacked in any order. Each ring has two colors for building dynamic rainbows. Once the tower is built, simply lift up the pole and watch the rings spin off the bottom - then build again! Comes with 6 rings, pole and base. Coated PVC plastic is BPA-free. For ages 12 months and up.