beaver means 60 to 68 inches; large is 55 to 60 inches; large medium, 50 to 55 inches; medium, 45 to 50; small, 40 to 45. anything under 40 inches is considered a cub and worth only a few dollars.
if selling beaver through the mail, be sure to pack flat, so they arrive at the buyer's in nice condition. if at all possible, be present when your beaver skins are sold. it is usually best to sell at home, so you know just what you are getting. 