Mrp sxg chain guide alloythe sxg is a low profile chainguide which is unlikely to come into contact with objects that you ride over should this happen to be the case the sxg has a lower bash guard that will protect your chainring if contact with trail objects were to occur featuressuited to downhill enduro and trail ridingpassive retention ensures the guide does not make contact with the chain unless neededfull size nylon hd upper guide with co moldingall install and adjustment operation