I almost gave these a 4 instead of a 5 because of the size.  These are 8 ounce mugs.  I would have prefer them bigger but I still think they are really nice mugs.  They are really more of a dark charcoal gray then black.  They have slim stripes all around with a lighter gray in between the charcoal raised  stripes -  hard to tell by picture.  They are stoneware and a nice weight.  Would recommend.