Flat sides > more surface contact > more sparks. Flat profile design, for greater control and greater efficiency. Approx. 8mm of direct striker-contact on each side 1/2" (12.5mm) thick Sånft-korr ferrocerium rod yields 20,000+ strikes Works at any altitude, in any weather... even wet. Includes leather lanyard and 6-function multi-tool scraper. Weight: 4.2oz