This is Baltic birch-veneered plywood. It is suitable for interior cabinetry applications. Sheet size is 5 feet by 5 feet. The appearance is rotary-cut (the veneers are cut from the log in a spiral). The core is veneer, which is structurally stronger than an MDF, or particle board, core.
A Note on Grade
Update: 1/11/22 We have successfully restocked all of our 5×5 Baltic Birch Plywood with the highest available B/BB grade. Please note that some of our current stock is a BB/BB grade which allows for some plugs. In what we have seen so far most sheets have plugs on one or both sides.