Wunderlich - Caps For Tail Frame Mounting / Paralever Strut for BMW G 650 X ChallengeThese covers provide the motorcycle with a small highlight, but also have a practical purpose. The paint on the sharp edges of the bolt gussets is prone to chipping. The cover protects and covers up already damaged paint, and prevents dirt and grime from filling up the cavity and causing oxidation and corrosion to the metal. Tip: Before installation of the covers seal and protect the bolt heads and metal parts with a suitable anti rust agent grease.