<p>How should I describe this part which looks like a small gear so that I can research replacements?</p>

<p><a href="https://i.stack.imgur.com/51BdD.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/51BdD.jpg" alt="image of a pulley"></a></p>

<p>This came with my FLSUN 3D printer, which may be based on a Prusa design.</p>

[{'answer_id': 10411, 'author': 'K Mmmm', 'author_id': 10369, 'author_profile': 'https://3dprinting.stackexchange.com/users/10369', 'pm_score': 1, 'selected': False, 'text': '<p>It is an "aluminum timing  pulley"</p>\n\n<p><a href="https://www.google.com/search?psb=1&amp;tbm=shop&amp;q=aluminum%20timing%20pulley&amp;ved=0CAMQr4sDKAFqFwoTCMis1KHmiuMCFRoMswAdMqUElxAB" rel="nofollow noreferrer">https://www.google.com/search?psb=1&amp;tbm=shop&amp;q=aluminum%20timing%20pulley&amp;ved=0CAMQr4sDKAFqFwoTCMis1KHmiuMCFRoMswAdMqUElxAB</a></p>\n\n<p><a href="https://www.ebay.com/i/152446519860?chn=ps&amp;var=453435947176" rel="nofollow noreferrer">https://www.ebay.com/i/152446519860?chn=ps&amp;var=453435947176</a></p>\n'}, {'answer_id': 10413, 'author': 'Sean Houlihane', 'author_id': 4927, 'author_profile': 'https://3dprinting.stackexchange.com/users/4927', 'pm_score': 4, 'selected': True, 'text': '<p>This is a timing belt pulley.</p>\n\n<p>Specifically, is a GT2 timing pulley, 2&nbsp;mm pitch (between teeth), 6&nbsp;mm wide. The drive diameter is measured by the number of teeth (16 in this case) , the shaft diameter (bore) is measured in mm.</p>\n\n<p>The \'GT2\' part refers to the tooth profile, some other examples are shown half way down <a href="https://www.pfeiferindustries.com/timing-belt-identification-and-replacement" rel="nofollow noreferrer">this page</a>.</p>\n'}]
['https://3dprinting.stackexchange.com/questions/10410', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/10369/']