Midwest Products Project Woods Balsa Mini Carving Block Economy Bag. Grown in South American rain forests, Balsa is kiln dried to produce a light weight and high strength-to-weight ratio wood. Balsa cuts easily with a hobby knife and can be stained or painted to represent any wood type. Balsa Carving Blocks are perfect for small projects and the Economy bag contains 72 Cubic Inch of balsa blocks in assorted sizes.