Vintage Pyrex Bake a Round Glass Bread Making Tube by CorningMade of heat-resistant glass. Use frozen dough, your own yeast bread recipe or on of the enclosed recipes. Crispy crust all around... and inside a nice, firm texture. Includes oven proof rack to hold, carry and store the baking tube. It is in very good condition with no chips or cracks. Includes the baking tube and the rack. Any questions, please ask.