Woodland Scenics Track-Bed offers these advantages: Quieter Operation (Sound Deadening Material), Smoother Operation (Cushions Vibrations), Easier to Use (Tack or Glue Down, Flexible, No Soaking, Compatible with Cork, Won’t Dry Out or Crumble), and a Better Value (Higher Quality…Lower Cost). This Bulk Pack of N scale Track-Bed strips are 3mm thick x 24 inches long.