Coffee Mugs Online @ Best Prices : Mr. R is a totally Rocking. To all the rock stars this is for you ! The alphabet R coffee mug is as refreshing as it looks and compliments the people who have the letter R as their initial. The coffee mug is designed with great focus on recreation and the fun one has in everyday life. The contrasting colours and geometrical designs give the coffee mug a unique aura. Go Rock it!