Carton of 50 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 top bar groove. Rigid foundation works best such as Duragilt or Plasticell. Fits 6 5/8 inch Supers Nails included Not Assembled.