Factory horizontal Stabilizer with 3/8 in tubing welded in to form an airfoil shaped horizontal stabilizer. Contains 5 upper and 5 lower ribs. Improves elevator authority at slower speeds and high AOA. Improves getting tail up on takeoff. Includes pre-fit aluminum tail fence and application of epoxy primer with purchase. Works very well to add useful weight to the tail on XL versions using the Lycoming or Continental platform. Send me your tail and I will modify it and ship it back.