All welded aluminum construction. Our standard models are built with .190/5086 bottom and .125/5052 sides. Our lightweight model uses .125/6061-T6 for the bottom and .090/5052 for the sides. The 7’6” wide has 5 t-bars, while the 8' wide has 7. All hulls come standard with ¼” UHMW polymer on the bottom. We have upgrade options for aluminum available.