Roosebeck 19.5 x 12.25 Inch Cajon Sheesham CJNRM. Roosebeck Sheesham Cajon CJNRM. This box shaped drum is made of sheesham on the top, bottom, sides and back. The front is thin Baltic Birch Plywood which acts as the striking surface. The 40 thin metal snares are about 6 inches long and are attached to 2 anchors on a tuning rod. The adjusting knob can make the snares touch the front or be free to sway. The sound hole on the back is a 5 inch circle. The playing surface is not restricted to the 19.25" x 12.25" front. Can be played on multiple sides and with hands, fingers, mallets and or beaters or tippers. There are 4 rubber feet on the bottom.