many afternoons of wholesome playtime. The Switch Set is a new exciting add-on set with a marble storage unit and switch that regulates the speed of several marbles. An essential item for the Quadrilla Marble Run enthusiast! Rail Set includes: Connecting Blocks (2 5/8 x 1 5/8 inches) 4 Orange Vertical Chute 4 Natural Vertical Chute & Drop Through Tunnel 5 Yellow Angled Chute 7 Red Alternating Angled Chute 7 Teal Angled Chute & Double Tunnel 8 Green Angled Chute & Drop Through Tunnel 6 Blue Angled Chute & Single Drop Through TunnelTunnel Accelerators 10 small red accelerators (1 x 1/2 inch) 2 large red accelerators (1 1/2 x 1 5/8 inches) Rails 5 Curved Rail with 2 hole drops (1 3/4 x 12 inches) 2 S Shape Rail with 3 hole drops (1 3/4 x...  (less)