Presented S4S Balsa Blocks ranges in sizes from a few millimeters to several centimeters in width, thickness, and length. Balsa wood is a very lightweight wood that is easy to cut, sand, and shape, which makes it a popular choice for model building, crafting, and other DIY projects. Balsa wood is also used in the construction of lightweight aircraft, boats, and other structures where weight is a critical factor. The strips are sold in hobby stores, craft stores, and online in various sizes and thicknesses to fit the specific needs of the project.