This is what I need to reinforce the ailerons and flaps on a medium to large airplane I am building. The 1mm size is ideal for stiffening these parts and other areas such as the foam tail boom of an airplane. Inserting two bars at once and overlapping them in a staggered pattern results in a thin reinforcement at each end and a double reinforcement in the middle, which stiffens the piece fairly well without adding unnecessary weight.