This marble-powered rocket spinner built from GraviTrax is one of a kind.
source
Check Also
REVIEW: GraviTrax Junior / My Planet Starter Set – Marble Run for Ages 3-7
This video review of GraviTrax Junior is loaded with Goodies & Freebies! Support my videos …
Ho does it spin?
Cool
Such cool ideas combinedπ€©π€©
Cool!
What do you think of the marble π spinner?