Many possible pencil makers out there, of varying adherence to quality control. The guys at castboolits generally use and recommend the "Mars Lumograph" set made by Staedtler in Germany. Bought mine on ebay a couple years ago, a 12 pencil set in a metal box, for 14 bucks to my door. Borrowed my rich friend's Saeco tester to check the accuracy of the pencils, pencils very accurate.
