Dogtra Contact Points are sold in sets of 2 and available in 4 sizes (½ inch, ? inch, ¾ inch or 1 inch). All Dogtra collars come standard with the ?" Contact Points and should work for most dogs with normal length fur. However, for very short fur you may want to consider the ½" points and for longer fur you may want to consider the ¾" or 1" points.