Fat Brain Toys Trestle Tracks Builder Set - 73-Piece Modular Marble Run, Ages 8+

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• A unique modular marble run with marbles that roll slowly and smoothly
• The paths cut out of each track widen gradually to propel the marbles forward
• Great for ages 8 and up; Follow the included templates or build your own marble run design
• Encourages spatial reasoning, creativity, engineering skills, problem-solving, critical thinking
• 73-piece builder set includes 1 catcher, 1 topper, 55 risers, 5 stainless steel marbles, 10 unique tracks, base grid