We mainly carry is Baltic Birch and MDF. Looking to expanding into other areas.
Our Baltic Birch Plywood comes to us in cases directly shipped to me from Russia 60x60. It is B/BB grade sanded sooth on both sides, and we cut it down in our shop to our stock sizes as well as custom sizes made to order. It is the preferred product for crafts that is exposed to the outdoor elements not directly in the weather just exposed. Ideally under a covered porch or eve and even then, it needs to be sealed yearly for best results.
Our MDF is a manufactured product that is composed of pulverized wood fibers mixed with resins and wax, before being pressed into flat panels under high temperatures and pressure. It is used as a building material in residential and commercial buildings and in cabinetry and furniture-making. MDF is available in several different types, depending on the needs of the job. This is best used on crafts that is painted and kept out of the outdoor elements.
Kerf
While cutting your boards to size I try and put the exact size. This may very a little, but most boards will be 1/8 inch smaller than size, this is why for an example 12x24 is listed as 11 7/8 x 23 7/8. My MDF is cut to size meaning a 12 x 24 will be 12 x 24.