Dogline Removable Interchangeable SERVICE DOG IN TRAINING patches - for vests, harnesses, collars. Unimax, Alpha, MaxAire, Omega Removable/Interchangeable patches Features printed, bold reflective letters for added safety. 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".