APM Building Materials is proud to offer Sliding door products from Cannonball. CannonBall is a leading supplier of components for the post-frame and metal building industries. The original producer of round track and trolley sliding door systems, CannonBall offers a wide range of building products including Entry Doors, Sliding Door Systems, Dutch Doors, Cupolas, Horse Stalls, Windows, Builders Hardware and much more. Browse our website to see what products we offer.