5mm thick x 12″ wide x 24″ long This roadbed product provides a quiet, smooth train operation and absorbs irregularities on your layout. It gives you a high-quality, economical alternative to other roadbeds. Track-Bed requires no pre-soaking like cork, remains flexible and wont dry out or become brittle. It aligns well with cork on any layout and is available in Rolls, Strips, Sheets and Super Sheets. For an almost seamless application, use the 24-foot Rolls. All Track-Bed comes in N, HO and O scale. This is a 6 pack of sheets.