All new and custom made HO scale sand load inserts for Bowser / Stewart 55 ton twin bay hoppers with prototypical hump profiles . All inserts are hand made one at a time from lightweight recyclable materials and sand . These loads look lower in the shell because , in reality , sand is denser and heavier than coal . These loads are 1-7/32 W x 4-1/8 L inches . Sale is for a set of 6 load inserts . Thank you for visiting KC's Shops .