The bright colors and moving gears are great for children going through their tactile discovery. They can watch the patterns spin as the wheels move and listen to the sounds of the gears turn. A world of wonder, right at their fingertips. The carriages click together and can be removed to change the size of your Gearapiller. You can make any kind of creation you want large or small, with the gears fitting back in place in whatever order you chose. The wheels of the Gearapillar are designed with rubber grips to help it move across smooth surfaces. This is especially great for active kids on hardwood floors. You can slow their roll a little bit while still protecting your floor from scratching wheels. Ages 9m+