For chain consistency and control in technical situations, TruVativ teamed up with chain guide masters MRP to bring you the 2X10 X-Guide. It features an aluminum back plate and MRPs replaceable Skid Plate design so its amazingly lightweight, yet can take a beating. The lower guide, along with a sealed bearing pulley provides excellent chain retention in the roughest terrain. Replaceable Skid Plate Design, lightweight chainring protection Lower guide and new sealed bearing pulley system combined with SRAM front derailleur keeps chains in check Low profile design compatible with SRAM 2X10 chain line