Gravitrax color change additive 26815
Thanks to this addition, we will achieve a magical effect - the ball will roll into the tunnel and... suddenly change color! This additive can also help stop or slow down balls. Building Gravitrax tracks stimulates the imagination, sparks interest in science (physics, spatial geometry and gravity) and provides hours of fun for both adults and children. Thanks to the Gravitrax Pro expansion kits and add-ons, the Starter Set can be expanded indefinitely. In addition, the entire Serio PRO (black packaging) is combined with GraviTrax (white packaging) - with all sets and accessories.
Contents: one Color Swap, 3 balls.Do you need help? Do you have any questions?Ask a question and we'll respond promptly, publishing the most interesting questions and answers for others. 
