Harrows Torpedo Darts - Steel Tip - Twin KnurlHarrows Torpedo Darts 80% Tungsten Darts. Torpedo tungstens feature parrallel barrels. Nylon shafts with flight retaining ring grips are teamed with patented Dimplex flights, creating an intermediate priced series for the developing player. Harrows Torpedo Darts 70% Tungsten Darts. Torpedo tungstens feature parrallel barrels. Nylon shafts with flight retaining ring grips are teamed with patented Dimplex flights, creating an intermediate priced series