We use only the highest quality SapimBrass Double Square spoke nipples when building your custom wheelset. We have a few suggestions for you depending on what sort of wheelset you’re building.Brass nipples will be the strongest and longest lasting spoke nipple option. They areslightly heavier than alloy spoke nipples,but we alwaysrecommend them over alloy nipples as they will be the most reliable.Why no alloy nipples? Alloy nipples simply are not durable enough for most mountain bike wheelsets, therefore we don’t offer them as an option.