M&M Chocolate Candies: Melt in your mouth, not in your hand... Do it!
Although not the candy-coated chocolates, M&Ms have been very popular since they were introduced in 1941. Worderfull years.
Besides M&Ms, what melts in your mouth and not in your hands?
They melt in your mouth, not in your hands used to be their slogan They are chocolate discs, covered in a brown coloured sugar shell.