Ravensburger Marble Run (Slope Toy) GraviTrax Zip Line Add-On Parts 27472 7 (Ages 8+) [Educational Toy, BirthdayChristmas Gift]

This additional part uses a hammer that moves like a ropeway to push balls placed at the front of the course. When a ball reaches the zip line, the hammer part starts moving, pushing any balls placed beyond it. Recommended ages: 8 years and up A starter set (sold separately) is required to play with this product.