GR-011 - Kluber NB52 extra high pressure grease we use in all Enduro XD-15, ceramic zero, ceramic hybrid, and stainless steel bearings. Kluber NB52 only runs better and smoother with time and is highly resistant to being washed out. It is engineered to stick to the balls and continually be pulled back into the ball path where it is needed. Conveniently packaged in a syringe for precise grease application.