Helical Spring Mechanics Demonstration Kit for physical science and physics is a heavy-duty set made for large-scale demonstrations.
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Here is the heavy-duty steel helical spring and weight set you need for large-scale classroom demonstrations. Use a meter stick and clothespins as markers to measure the spring extensions in your experiments. The spring is over 20 cm long. Comes with one 1000-gram weight with single hook, one 500-gram weight with double hook and one 200-gram weight with double hook.