WSB80 (also known as B80) is the part number for the Medium Buff Ballast manufactured by Woodland Scenics. It is a crushed rock modeling material used to simulate realistic railway track beds, gravel roads, and stony embankments for any scale (though perfectly sized for HO and S scale).
The bag contains 21.6 cubic inches (353 cm3) of warm tan-colored material. It is colorfast, lightweight, and designed to permanently adhere to track-beds using a product like Scenic Cement.