Mystery Letter in Tire size info

So what does the "B" or the "W" mean in the description LT285/75R16E1 126P B or LT285/75R16E1 126P W? I know what everything else means, but I cant figure out what the last letter means. There is a price difference of about 17 bucks, but no description of what it means. Here is where I am getting the numbers from:
http://www.discounttire.com/dtcs/fi...w=false&rc=UTSINT&cs=285&sortBy=prca&toggled=

Any chance someone can shed some light on this for me?

I also noticed that the W tire was listed as special order where the B tire was simply listed as X number in stock. Most of which were 0. If that helps.

Thanks to anyone who might be able to help.

 

Black or white lettering would make sense. I guess it just surprises me that white lettering costs 17 dollars more. Now I kinda feel dumb. Thanks for the fast reply.

+1