champion iridium- boxed – qc8wep champion iridium – the ultimate element. This spark plug’s fine-wire iridium center and platinum ground electrodes provide the sharpest spark focus for maximum performance. heat-active alloy allows electrodes to reach optimal temperature quickly maintains stable operating temperature under all engine loads v-trimmed ground electrode promotes sharper spark focus fine-wire center electrode and v-trimmed for greater ignitability iridium center electrode delivers maximum life champion iridium – maximum performance. Premium spark plug champion iridium 9809 spark plug (carton of 4) application summary: marine