TruStone is a pliable stone pen blank. Made from stabilized crushed stone, this material can be used on a wood lathe with hand chisels. TruStone requires no extra finish and can be polished to a smooth finish just like an acrylic blank. Warming the finished blank with a hair dryer or similar will make the material softer and less likely to crack during pen assembly. These are drastically discounted because they may have voids due to bad batches of Trustone. They’ll still look good, just may have some tiny voids.