Matingmark harnessis used in conjunction with Mating mark ram crayons but will hold other types of crayon. The harness is easy to secure and use, enabling quick and simple changing of ram crayons by simply sliding the crayon into the holder. The Matingmark harness has strong buckles that are easily adjusted.Crayons are available separately. The webbing keeps its shape and it doesn’t cut into the animal’s skin. The Matingmark harness is easy to fit, stays in place after days of work.