Annoying CRT screen interference caused by magnetic fields is said to be eliminated with ImageGuard II CRT enclosures. They are fabricated from CO-NETIC AA alloy, a proprietary material that intercepts magnetic interference before it can cause problems such as jitter, color smears and blotching. The enclosures are available in a variety of colors and finishes. They are said to be easy to install and come in models to fit all popular CRT screen sizes.