BonJour Coffee Insulated Borosilicate Glass Coffee Mugs, 2-Piece Set, 10-Ounces Each Durable and lightweight hand-blown borosilicate glass mug; 10-ounce capacity Double wall insulated construction keeps beverages deliciously warm or cool; won't burn fingers or leave rings on your table Sleek and modern with minimalist styling; creates a unique and elegant "floating" presentation