Esbit 1300-Degree Smokeless Solid Fuel Tablets for Hobby, Outdoor, and Emergency Use, 20 Pieces Each 4g Virtually smokeless and residue-free solid fuel tablets are ideal for hobby applications and starting campfires Contains 20 x 4g tablets; each tablet burns approximately 5 minutes and up to 1300F Works at high altitudes and sub-zero temperatures; ignites with match or lighter Strong heating output makes provides an effective emergency heat source; great for emergency preparedness planning Available in in 4-gram (5-minute burn time) and 5-gram (7-minute burn time) sizes (sold separately)