The ProMaster range of Indoor Putting Greens is the only range that includes an interchangeable 2½” Training Reducer. The ProMaster 2½” Training Reducer allows you to reduce a standard sized 4 ¼” hole at any time to a 2½” sized hole to help improve your skill level. Whilst it is available as an accessory product, it is included with every ProMaster Indoor Putting Green as standard.