Moose Racing Colored Chain Guides - Blue 1231-1059Outer anodized plates made of CNC machined 6061 Aluminum 3D designed inner slider to help in not allowing build up of debris around chain that may cause chain to derail TPU inner guide material provides perfect wear resistance for chain to ride on along with minimizing wear to the chain block TPU compound helps reducing load on swing arm and mounting brackets of chain guide due to impacts High quality anodizing helps prevent fading in high UV climates