Cabinets consist of six-sided wooden boxes or "carcass" closed on five sides with a door or drawers on the sixth. Cabinet faces. Solid wood remains a popular choice for many cabinet parts, including bases, frames and doors. However, most commercial cabinets have sides, backs and bottoms made of plywood or particle board. Traditional-style solid-wood cabinetry is more expensive and many consumers opt for cabinets that incorporate many particle board or plywood components to reduce costs. Pricing for solid wood cabinet doors depends on the wood species used. For example, teak is more expensive than cherry, which is more expensive than maple, which is more expensive than oak. Similarly, solid wood is more expensive than plywood which, in turn, is more expensive than particle board or similar sheet goods. Cabinet body. The cabinet carcase is usually made from plywood or high-quality particle board, particularly for flat sections that do not need to be shaped, such as shelves, cabinet sides, or drawer bottoms. Typical plywood thickness in these applications varies from to [with used often for drawer bottoms]. Stiffness and strength are important factors since cabinets are expected to retain their shape over time and avoid bend or sag while continuing to support a heavy load. The best choices for strength are plywood and higher-quality particle board; they also have the benefit of being less susceptible to warping from moisture. Stiffness increases rapidly with shelf thickness; regardless of material choice, a shelf is 73% stiffer than a shelf, even though it is only 20% thicker. Shelves made of some particle board formulations, especially where not reinforced, may sag or deform. Particle board strength and rigidity varies by formulation and is determined by the resin used. Plywood carcases are usually assembled with screws and nails, while particle board carcases do not hold screws or nails as well and therefore are typically joined with glue, groove joints, or mechanical fasteners such as confirmat-cam assemblies. Generally, plywood-carcase cabinets are more expensive than particle-board-carcase cabinets. Cabinet frames and doors may be fashioned from solid wood (typically a species of hardwood), medium density fiberboard (MDF), particle board, plywood, or a combination, and may include lamination or a surface coating over these core materials. A floating panel in a door can be hardwood-veneer plywood captured within a solid wood or MDF frame. Solid wood and MDF can be edge-shaped, e.g., to round or pattern the edges of doors,