Are there any size restrictions concerning the personalization of the mugs?
There are no restrictions as to number of characters, color of fonts, style of fonts and size of fonts nor placement of characters as long as they all fit into the available space to be decorated (3″ x 3″ for a normal decoration, wrap-around and handle-to-handle decorations can be wider in size). The personalization can be on a “blank” side (not decorated side of the mug) or below/above a decoration or logo as long as all fits in the available space.