<p>Periodontal Files F3/4S are excellent for breaking up tenacious or large calculus deposits. These dental instruments have the following features:&nbsp;<br />
&bull;&nbsp;&nbsp; &nbsp;Double-Ended&nbsp;<br />
&bull;&nbsp;&nbsp; &nbsp;Premium Grade&nbsp;<br />
&bull;&nbsp;&nbsp; &nbsp;Ergonomic Design&nbsp;<br />
&bull;&nbsp;&nbsp; &nbsp;Reusable&nbsp;</p>