WalthersTrack Roadbed is designed to give you a great foundation for your track with its dense, closed-cell foam. It matches most common HO cork roadbed dimensions and features a smooth surface with no extra sanding required. WalthersTrack Roadbed can be finished with ballast, adhesive and foam-safe paint, and track can be nailed or glued to the roadbed surface. It is easy to cut or split with a hobby or utility knife so you can install it where you need it. 3/16 thick, 3-1/2 wide at top, 3-7/8 wide at base 36 long