Alex Toys Rainbow Rollers Alex Rainbow Rollers is a four tier wooden roadway and 4 colorful roll over race cars. See how high up the rainbow you can go to get the knack for this colorful track. Start the cars at the top of the rainbow roadway and watch them gain momentum as they speed toward the edge. If the speed is right the cars will flip over the edge and race down the next level. Too fast and they crash, too slow and they won't go.