Dogline "Therapy Dog Removable Velcro Patches Removable/Interchangeable Velcro patches Features printed, reflective letters. Unlike embroidery patches, they will not get caught on objects and thread will not come apart Patches come as a set of 2 Fits perfectly on our Unimax Harness, Unimax Utility Bags, Alpha Harness, and MaxAire Mesh Vest XS patches measure 1" x 2.75", S/M patches measure 1.5" x 4", L/XL patches measure 2" x 6"