Plain, open deep groove ball bearing, can be packed and re-packed with grease of your choice.  See applicattion list for recommended fitting.  This bearing needs a dust seal to prevent water/dirt ingress and grease overspill.  BK or Dunlop manufacture.  If you require a specific brand of bearing, please let us know.  This choice may impact on price and deilvery, so if there is a difference, we wil always quote you before going ahead with non-standard items.