All Lee mould blocks are made from aluminum because of its exceptional moulding qualities. All mould cavities are CNC machined for unmatched roundness and size control.Open the mold upside down to the empty. Close it and you're ready to cast the next. The core pin automaticaly centers in the mold. Easily cast 200 per hour. A quality mold built to last as long as your rifle. Handles and sprue plate are included.