Made of Nylon. This Innovative, multi-functional hand guard kit allows 4 different configurations: MX open, Strong closed, ATV without bracelet and Strong closed without bar and cover. It can be fitted on Cross bike, dirt bike, motard, and ATV. Great flexibility of use. The kit is included (for aluminium handlebar). MIN. ø 13,6 mm. - MAX. ø 14,6 mm.