Heavy-duty yttrium-enhanced nickel center electrode with copper core provides a longer lasting copper core spark plug. Nickel Spark Plug. Spark Plug. Warranty Duration. 10, 1041, 2, 2262, 318, 4, 41-602, 41-629, 41-800, 41-801, 41-806, 41-814, 41-905, 5224, 739 21045 108, 739 21045, BE1H10, E3.48, F1000-37597-BOS, FR 8 LCX, FR1LS, GRP33, R42TS, R42XLS, R43XLS, R44T, R45TS, RBI7562, RC12MC4, SP-445, XS5224DP, ZFR5F-11, ZFR6A-11.