Molecular Model Nylon 6.6-(ELS-MMS032) offers a thoughtfully designed, durable resource for hands-on learning. Molecular Model Nylon 6.6 - ?. Quality colour-coded, 3D educational models ?. Organic / inorganic chemistry, biochemistry & general science ?. For use by students & teachers at school, college or university ?. Atom parts range in size from 17 to 23mm.