An alfalfa cube is made from Alfalfa hay compressed under high pressure and extruded in a cube about 1.25 inches square and 2 to 4 inches long depending on were it breaks off. I stabilized them in Poly, but had to do it 3 times in order to strengthen them up enough. I have found that it is very hard on tool steel since there is so much grit in the hay cubes. I will have to sharpen my Gouge and skew at least 2 times each just to make 1 pen; usually I can do 10 or more wood pens before re-sharpening. My poor band saw blade has taken a real beating. But it seems to be worth it since they are very unusual and sell well. If you want more details I would be happy to share.