Penn/MD Materials has been producing a full line of stone products including the many sizes of rip rap since 1989. Located on the Mason-Dixon line in Peach Bottom, PA we serve customers in MD, DE, as well as PA. Our blue/gray serpentine aggregate meets all the approvals for MDDOT, DELDOT and PENNDOT application. Penn/MD is a full-service quarry carrying and supplying sand products, various decorative aggregates and offers delivery service for all products. Penn/MD has a blending operation on site to accommodate MDDOT projects.