I bought these mugs as a gift for a friend. I made sure I picked a set with 2 different colors so they would each have their own mug. These mugs are 13.5 oz. Mugs come in black and white. These make great anniversary, house warming and birthday gifts. You can also give them just a gift of friendship. These have double wall insulation, a solid line at the top and dotted at the bottom. The solid part of the line says the company name and the dotted portion says just here. Made out of lead free and non-toxic ceramic.