Unfinished cabinet doors that are Paint Grade material are a combination of poplar, maple or alder rails and stiles with an MDF panel. Poplar, maple and alder are durable hardwoods that machine with sharp detail. MDF is very dense hardboard made with fine wood particles under extreme pressure. MDF can be machined with crisp, durable details and is an almost perfect painting surface. Paint grade cabinet doors and drawer fronts are the perfect DIY home renovation choice for all of your cabinetry needs.