Woodland Scenics Track-Bed Roll 24' HO5mm x 1.75" x 24' Continuous Roll of Track-Bedfrom Woodland Scenics. FEATURES Durable non-absorbent Black foam material Conforms to all applicable NMRA standards Sound-deadening and vibration-cushioning for quieter, smoother operation. Flexible material can be tacked or glued down and won't dry out or crumble. Great underlayment for multi-track yards, switches, loading areas and sidings. INCLUDES One HO Scale 5mm x 1.75" x 24' Continuous Roll of Track-Bed REQUIREMENTS Hobby Knife Foam Tack Glue Adult Supervision SPECIFICATIONS Length: 24' (7.31m) Width: 1.75" (45mm) Thickness: .25" (6.35mm)