Balsa Shaping Blocks
The Balsa Shaping Block is probably the most commonly used tool when hand-shaping a surfboard. Use the balsa side with low-grit sandpaper for hard sanding, like squaring up the outline or working down the stringer. The soft foam pad side with various grits sandpaper for smoothing out bumps and blending. Use with standard 9x11 sandpaper sheets.