Create the element of surprise! Use the Tunnels to hide the marbles as they travel through your track. Combine the Tunnels with your GraviTrax Starter-Set for added mystery to your track. Will you be able to keep your eye on the marble as it rolls through the tunnels? \r\n\r\nThis set is suitable for 1+ players, ages 8 years and up.\r\n\r\nContents\r\n4x Curved Tunnels, 2x Straight Tunnels, 2x ‘Y’ Junction Tunnels, 2x Card Bases, 1x Vertical U-Turn, 2x Drop Rails, 2x Bent Rails