Acme United Westcott does not sell the lead for the compass in the math set item 15420.
However 3 lead (graphite) tips are inside the 15420 package, including the one already in the compass.
Replacement lead/graphite inserts for professional drawing tools have a standard diameter, varying only in the length.
We recommend consumers shop at Amazon and search for "compass lead refills" The standard size if 2mm diameter by 3/4 long .
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