Helix Geometry 4 Piece Set, Large (17891)
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<b>[Product Information]</b><br>
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<li>Dimensionally stable transparent blue-tinted plastic</li>
<li>Included rulers graduated in metric and imperial</li>
<li>Clear, precise markings for ease of use</li>
<li>Dimensionally stable transparent blue-tinted plastic ^Included rulers graduated in metric and imperial ^Clear, precise markings for ease of use</li>
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