FireSteel Miniature (3-Pack) Genuine FireSteel.com FireSteel Premium Firesteel formula that creates excellent sparks for a rod of this size. Easy to use and very safe (Size: 3/20 inch diameter by 2 inches long). Premium FireSteel.com firesteel formula that takes your firesteel firemaking to a whole new level. 5500 F (3000 C) sparks that will start a fire in the toughest conditions.