3-0X6-8 1-3/8 8720 1-Panel/Shaker Solid Core Machined Door Right Hand Slab - is one of today's most recognized brands for painted interior doors. The method of construction and internal components are the same as Simpson wood doors. And when combined with MDF veneers on stile and rail surfaces, solid MDF panels and an impeccable priming process, the result is an architecturally beautiful, long-lasting interior painted door.