0250002004 Bosch Glow Plugs Duraterm Chromium: another innovation from Bosch. Guaranteed premium quality, double the service life. The new Duraterm Chromium from Bosch – powerful state-of-the-art glow plug technology. The high-grade glow tube material – an alloy of nickel and chrome – provides efficient corrosion protection and increases service life by 100%. And that at half the warm-up time thanks to the ground-breaking Duraterm dual-material control filaments.