Mountain biking is done in every type of weather and unfortunately that also affects the chainrings. The SRAM / Truvativ chainrings are made out of 7075 aluminum. These chainrings are suitable for the X0 / X9 / X7 cranksets. SRAM makes no distinction in quality within these groups.
When choosing the proper chainring you should check several things on your current crankset. First of all, it must be a double crankset with two chainrings. Additionally, there are two different crank sets in circulation in which the distance between the blade bolts are not the same. Namely a 39/26 variant with bolt circle 120mm/80mm. And a 38/26, 36/24 or 36/22. These last three have a bolt circle of 104mm / 64mm.