Gravitrax PRO Extension Vertical Marble Interactive Track System Helmets Archival-Quality Preservation: Crafted with one

Archival-Quality Preservation: Crafted with one side acid-free coated material

so it has only 192 possible permutations

Tube: Height 8 inches

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Gravitrax PRO Extension Vertical Marble Interactive Track System Helmets Archival-Quality Preservation: Crafted with oneONE BRAND NEW GRAVITRAX PRO EXTENSION VERTICAL RAVENSBURGER MARBLE INTERACTIVE TRACK SYSTEM. This extension vertical is an add on only to the starter set, which you must already have and is sold separately. GraviTrax is an innovative marble run and construction toy for boys and for girls ages 8 years and up. It is an ideal Christmas gift or birthday gift for smart, curious kids. The GraviTrax PRO Vertical Expansion Set offers 33 additional elements to