We have literally gone through an opened every bag, lovingly caressed each tail and graded each tail either A or B. There will always be variation in tails and what may suit a 14" Beast Fleye may not suit a 1/0 Clouser, so its not fair to price them the same or label them the same.
A Grade tails are selected for length and hair quality, these tails are for large flies and also to suit different tying techniques such as Hollow Fleyes as an example. These are hard to get and supply is limited. Hair length is on average 4"-4.5" and will vary over the length of the tail and between tails. Black tails are generally around the 4' range