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<p>[QUOTE=&quot;ToughCOINS, post: 2117874, member: 20480&quot;]Mylar is an inherently brittle material, and the thicker it is, the more prone it is to cracking when flexed.&nbsp; Therefore, it is not well-suited for use in making thick flips.</p><p><br /></p><p>Natural rubber is high in sulphur content, primarily to maintain its highly elastic properties, without which the rubber bands would stretch, but not recover when removed.&nbsp; The rubber bands outgas the sulphur, which permeates the mylar.</p><p><br /></p><p>The best solution is to not wrap rubber bands around flips for extended periods of time.&nbsp; I rarely do so, typically using rubber bands only when traveling to and from shows, or when bundling coins submitted to the TPGs.</p><p><br /></p><p>&nbsp;- Mike[/QUOTE]</p><p><br /></p>

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