Compact Size: 4.25" diameter, 3.8" tall (nested) 5.7" tall (assembled); weighs only 9 oz * Made using premium quality fully hardened 304 stainless steel and nichrome wire * Efficient and ultra clean burning. Features a secondary combustion via a unique double wall construction * Burns twigs, wood and other bio-fuel. Boils water in 8-10 mins (34 fl oz water) * Swedish FireSteel Army: 5400°F (3,000°C) spark makes fire building easy in any weather, at any altitude. Used by a number of armies around the world.