Lead-Free Markers offer clear identification for all of your imaging needs while protecting the environment from exposure to lead. Go Green with these Non-Lead markers!. Bismuth characters are completely encased in crystal clear epoxy. The markers do not contain any lead material. Other non-hazardous metals are used to form the characters and any applicable backing. These markers are available in two main categories, either Self-Adhesive x-ray markers or Non-Adhesive x-ray markers with either an aluminum or a tough polycarbonate backing. These Markers are available as the standard sets of Right and Left Markers, or just single Right or Left.