Reflective Tag Collars For those who prefer not to leave a martingale on all day but still want something to hang those tags on a reflective tag collar is an option. Soft and comfortable the flexible base is completely wrapped in cuddle satin. Sized medium for necks up to 18 inches and one inch wide with nickel hardware. If you prefer a custom size please send an email. Choose the color you prefer from the drop down below. Shown is black, neon pink and neon green.