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FIDGET AND SENSORY TOY: Cascade it hand to hand, stretch it out, let it snap back. The steady weight and tactile feel make it a quiet fidget for a desk, a classroom or a car – no batteries, no noise, no screen. WALKS DOWN STAIRS ON ITS OWN: Tip the top over a step and gravity does the rest, the coil flipping end over end all the way down. Still the best party trick in a toy box, and it works on any stair or gentle slope. SEE PHYSICS IN ACTION: At the top of the stairs the coil holds potential energy. Tip it and that stored energy converts to kinetic energy, carrying the motion down step by step. A STEM demonstration you can hold. SOLID METAL BUILD: Made from metal rather than plastic, so it has real weight in the hand and a distinctive sound as it moves. Built to survive a toy box rather than bend out of shape on the second afternoon. AGES 3 AND UP, KIDS AND ADULTS ALIKE: Simple enough for young children and satisfying enough to keep on a desk at work. Produced under licence for the Science Museum, so every purchase supports the museum.