The Eureka Number Holder is suitable for all disciplines. It has plenty of adjustment as it features a buckle on both the rear and far side around the neck. The strap from the bottom of the number which slides onto the girth is removeable with a press stud allowing the number holder to be used in led classes. The number window is approximately 10'' x 7.5". One Size fits Most. Available in black and brown. (Numbers not included)