BULL'S Challenger Darts - Steel Tip - 90% Tungsten - Arno Merk - 22gBULL'S Challenger Darts Steel Tip 90% Tungsten Arno Merk 22g. The Arno Merk Challenger Steel Darts combine precision engineering with a distinctive design, perfectly suited to Arno Merk's playing style. Made from high quality 90% tungsten and available in 22g, these darts offer a professional setup with both style and substance. The barrel features a visually striking separation between two grip zones. The front section is relatively