Carton of 10 Grooved Top Bar/Grooved Bottom Bar Dadant Frames. 18% more wood in end bars ( Full 3/8" Thickness) Grooved bottom bar is stronger and easier to use. Foundation is placed in frame in grooved bottom bar and top bar groove. Rigid foundation works best such as Duragilt or Plasticell. Fits 6 5/8 inch Supers Nails included Not Assembled.