The sliding door track hardware and interior door combination integrate style and functionality. The sliding track design transforms your doorway while saving space. Calhome primed doors are made of high-quality MDF, a high-quality composite material milled in a one-piece frame to withstand changes in heat and humidity better than solid wood. Each door is carefully crafted in the USA to ensure quality over the years. For best results with sliding door hardware, a select door at least 1" wider than an opening.