The YBB Rebuild Kit is something you will definitely need at some point in time, depending on how much you ride that YBB bike of yours. The slider is the part that wears out. The rebuild kit comes complete with a new slider, a rubber wiper and the aluminum cup the slider fits into. YBB Replacement Spring is sold separately.
You will need to remove your current YBB build and measure the slider for sizing.
This is a NON-REFUNDABLE item.