CSI SaddlePad SHIMS Large:  Shim sets (2) provide assistance for horses with anatomical and/or saddle fit issues. PLEASE NOTE: 95% of horses using a CSI Saddlepad DO NOT need shims! If you think your horse needs shims, you might consult with one of our saddle fit experts before you buy a set of shims. Large shim is the shape of our flexplate to assist with bridging.