One of the glasses has minor chips, see photos The VTG Corning Ware MCM Glas-Snap Coffee Drink Mug Cup set includes four black glass and plastic mugs with a capacity of 12 fluid ounces each. These vintage mid-century modern mugs are roughly 5 1/2 inches tall and have a diameter of roughly 2 1/2 inches at the top. Made in the United States in the 1970s, these original CorningWare mugs feature a unique Glas-Snap design, making them a stylish and practical addition to any kitchen or dining table. Perfect for both men and women, these mugs are a timeless piece of decorative cookware that adds a touch of nostalgia to any collection.