Kullerbu Traffic Jam Ball Track SetKullerbu Traffic Jam Ball Track Set creates a play effect where balls are racing down the momentum track when what's this? They're stuck in the ball collector! When they back up, the "stop and go" lever is released, and they can race together again toward the funnel. Then it's back onto the track and heading for the dominoes! Can be combined with other Kullerbu ball track sets and accessories to create bigger and better layouts. Kullerb takes the