Use these markers to conveniently indicate Left and Right views. Order mixed sets (one round/one square) to quickly identify correct marker by feel. Identify technologists, departments, etc. with custom engraved letters or numbers. Markers are also available with “D” and “G” to indicate “Right” and “Left” in French. Manufactured in polycarbonate plastic which is virtually unbreakable and resistant to alcohol which may be used to sterilize the marker.