This is an HO Scale 5mm x 1¾" x 24" Continuous Roll of Track-Bed from 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 1¾" x 24" Continuous Roll of Track-Bed REQUIRES: Hobby Knife Foam Tack Glue Adult Supervision SPECS: Length: 24" (7.31m) Width: 1¾" (45mm) Thickness: ¼" (6.35mm) sdw 2/27/01 ir/jl