Size is as-packaged, or the diameter of loose marbles. ("D" is the diameter of round items other than marbles.)
Quadrilla components are fully interchangeable among sets and use standard 5/8" or 16mm marbles. Get ready for a wild ride with our biggest ever Quadrilla set. Features 36 distributor blocks and a combination of spiral twists, S shaped rails and curve rails for the ultimate Quadrilla experience - this is the cheapest you will find this set offered for online!
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Quadrilla Marble Run - The Ultimate
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