Particle Board Shelves 3ft. 4ft. Wide 48 In. x 12 In. Particle board is strong and resistant to warping for a long life. Boards may be screwed to shelving supports for extra stability. Shelf can hold up to 2400 pounds per shelf as long as the shelf is uniformly loaded. Customize your shelving size based on the width and depth of your steel shelving frame. Order total must be greater than $150 to fulfill.