ONEUP ISCG05 TOP CHAIN GUIDENO MORE DROPPED CHAINSDropping a chain can ruin a good ride. There are ways to prevent chain dropping, but one of the most effective ways is to use a chain guide. The OneUp ISCG05 Top Chain Guide is designed to eliminate dropper chains forever. It features a simple, one tool installation and adjustment as well as a tool-less flip. You can easily install this without removing the crank and it is Boost and oval chainring compatible. At only 40g, you'll install it and forget it's there.FeaturesEasy to install with just one toolInstalls without removing the crank and is Boost and oval chainring compatibleTool-less upper guide flipSpecificationsWeight40gCapacity26 - 38TChainline7.5mm AdjustmentMountISCG05Material7075 Aluminum, Top Guide Glass Reinforced Thermoplastic | Oneup ISCG05 Top Chain Guide Top